Why is Kang Bi-o so obsessed with Choi Jeong-yo in Four Hands?
On the surface, the answer seems obvious.
They are rivals.
Bi-o is the disciplined elite pianist who has spent years perfecting his technique.
Jeong-yo is the instinctive genius who seems capable of producing extraordinary music almost naturally.
One has worked relentlessly.
The other appears to possess something that cannot simply be learned.
That alone would be enough to create rivalry.
But Bi-o’s feelings toward Jeong-yo go much deeper than jealousy between two talented pianists.
Jeong-yo represents the one thing Bi-o desperately wants but cannot earn through practice: recognition from his grandfather, Kang Seung-woon.
That is why defeating Jeong-yo becomes so important to him.
Bi-o is not simply trying to become the better pianist.
He is trying to prove that he deserves to be chosen.
Bi-o Has Everything Except the Recognition He Wants Most
Bi-o appears to have many of the advantages associated with an elite young musician.
He has received serious training.
He understands competition.
He has discipline.
He has ambition.
And he belongs to a family deeply connected to classical music.
But there is one problem.
The person whose recognition matters most to him is not easily impressed.
His grandfather, Kang Seung-woon, is not simply a family elder.
He is a renowned conductor and a musical authority.
That changes the meaning of their relationship.
When Bi-o looks at his grandfather, he does not only see someone who should love him as family.
He sees the person whose judgment can confirm whether his entire life of training has been worthwhile.
Bi-o wants to hear:
You are exceptional.
And more importantly:
I choose you.
Then Jeong-yo appears.
Jeong-yo Has What Bi-o Cannot Practice For
Jeong-yo is dangerous to Bi-o because his talent seems fundamentally different.
Bi-o’s strength comes from structure.
Jeong-yo’s strength comes from instinct.
Bi-o has learned how music should be played.
Jeong-yo seems able to ask what else the music could become.
This distinction matters.
If Bi-o were competing against another technically excellent pianist, he could respond in the way he understands best.
Practice harder.
Improve his technique.
Correct his weaknesses.
Become more precise.
But how do you practice your way into someone else’s instinct?
How do you defeat a person who hears something you do not?
That is what makes Jeong-yo terrifying to Bi-o.
Jeong-yo does not simply challenge his skill.
He challenges Bi-o’s belief that enough effort can guarantee victory.
The Grandfather’s Choice Changes Everything
The rivalry becomes much more personal when Kang Seung-woon chooses Jeong-yo for an important musical opportunity.
This is the turning point.
If an unrelated conductor had chosen Jeong-yo, Bi-o would still have been hurt.
But this decision comes from his grandfather.
That transforms professional rejection into emotional rejection.
From Seung-woon’s perspective, the decision may have been entirely musical.
If he believed Jeong-yo was the right person, choosing Bi-o simply because he was his grandson would have been favoritism.
But Bi-o does not experience the decision as an abstract question of fairness.
He experiences it as:
Grandfather looked at both of us—and chose him.
That is a completely different wound.
Bi-o Is Not Really Fighting Jeong-yo
This may be the key to understanding Bi-o.
Bi-o believes he is competing with Jeong-yo.
But psychologically, he may actually be fighting his grandfather’s judgment.
Every time Jeong-yo receives praise, Bi-o hears:
“You are not enough.”
Every time Seung-woon recognizes Jeong-yo’s musical instinct, Bi-o feels his own years of effort becoming less valuable.
Every time Jeong-yo succeeds, the same question returns:
Why him and not me?
That is why simply becoming successful may not satisfy Bi-o.
He needs to defeat Jeong-yo specifically.
Because if he defeats Jeong-yo, he can finally challenge the judgment that wounded him.
He can prove:
Grandfather was wrong.
Does Bi-o Actually Hate Jeong-yo?
This is where the word “hate” becomes complicated.
Bi-o certainly resents Jeong-yo.
He is jealous of him.
He is threatened by him.
He becomes increasingly obsessed with competing against him.
But Jeong-yo himself may not be the true source of Bi-o’s anger.
Jeong-yo did not create Bi-o’s need for approval.
He did not force Seung-woon to choose him.
And he did not decide that his own talent should become the standard against which Bi-o measures himself.
In many ways, Jeong-yo simply exists.
That may be exactly what makes the situation worse.
If Jeong-yo were deliberately cruel or manipulative, Bi-o could easily justify hating him.
But natural talent is not an attack.
Jeong-yo does not need to intentionally hurt Bi-o.
His existence alone is enough to remind Bi-o of what he fears he lacks.
Talent vs Hard Work Is Only the Surface
It would be easy to describe Four Hands as a familiar story about talent versus hard work.
Jeong-yo is the genius.
Bi-o is the disciplined competitor.
But the drama becomes much more interesting if we look beneath that structure.
Bi-o is not suffering because hard work is meaningless.
His hard work has clearly made him an exceptional musician.
The problem is that he has attached his self-worth to comparison.
It is no longer enough for Bi-o to become great.
He needs to be greater than Jeong-yo.
And once success depends on another person losing, there is no easy way to feel satisfied.
Even if Bi-o wins one competition, Jeong-yo still exists.
Even if Bi-o receives applause, he can still wonder whether his grandfather secretly believes Jeong-yo is more gifted.
The rivalry therefore becomes impossible to finish.
Seung-woon Seems to Understand the Danger
This makes Kang Seung-woon’s warning about the relationship between Bi-o and Jeong-yo especially important.
He tells Bi-o, in effect, to think about who will become completely devastated if the rivalry continues.
That is a remarkable warning.
Seung-woon appears to understand something Bi-o does not.
The greatest danger is not losing to Jeong-yo.
The greatest danger is allowing Jeong-yo to become the measure of Bi-o’s entire identity.
Because once that happens, Jeong-yo controls Bi-o without even trying.
If Jeong-yo succeeds, Bi-o suffers.
If Jeong-yo receives praise, Bi-o suffers.
If Jeong-yo is chosen, Bi-o suffers.
Bi-o’s happiness becomes dependent on what happens to someone else.
That is why Seung-woon’s warning may ultimately have very little to do with a piano competition.
It may be a warning about self-destruction.
But Seung-woon Also Helped Create the Problem
There is an uncomfortable contradiction here.
Seung-woon may understand that Bi-o’s obsession is dangerous.
But he is also one of the people whose judgment gave that obsession so much power.
Bi-o desperately wants his grandfather’s approval.
Seung-woon knows this.
Yet his approach appears to remain harsh and uncompromising.
Musically, that may be understandable.
A conductor should not lower artistic standards simply to protect his grandson’s feelings.
But a grandfather has responsibilities that a conductor does not.
This is where Four Hands becomes more complicated than a simple rivalry story.
Perhaps Seung-woon was right to choose Jeong-yo.
But being right about music does not automatically mean he handled Bi-o correctly as family.
The decision may have been fair while the aftermath was emotionally disastrous.
Those two things can both be true.
What Bi-o Really Wanted Was Not First Place
This may explain why Bi-o’s obsession cannot be solved simply by winning.
Suppose Bi-o becomes No. 1.
Would that heal him?
Probably not.
Because first place was never the deepest goal.
Recognition was.
Bi-o wants someone he respects—especially his grandfather—to look at him and say that all the effort mattered.
That he is worthy.
That he is special.
That he was not second choice.
Without that emotional resolution, trophies cannot solve the problem.
Bi-o could stand on the highest stage in the world and still wonder:
Would Grandfather have chosen Jeong-yo if he were here?
That is the tragedy of his rivalry.
Jeong-yo’s Disappearance Does Not Give Bi-o the Victory He Wanted
Then the story becomes even crueler.
Jeong-yo disappears.
Later, we learn that his right arm has been seriously injured and that his path as a pianist has been destroyed.
In one sense, Bi-o’s greatest rival is gone.
But this does not necessarily free Bi-o.
It may do the opposite.
Because Bi-o never truly defeated Jeong-yo.
There is no final performance that proves Bi-o was better.
There is no clean victory.
The competition simply stops.
And that leaves Bi-o with a question he can never answer.
Could I actually have beaten him?
For someone as competitive as Bi-o, that uncertainty may be worse than defeat.
Jeong-yo Returns in the One Way Bi-o Never Expected
This is why Jeong-yo’s return as a conductor is potentially devastating.
Bi-o may have spent years imagining Jeong-yo as the pianist he needed to defeat.
But Jeong-yo returns outside that competition.
He is no longer sitting at the other side of the piano.
He is standing in front of musicians.
That changes the relationship completely.
Bi-o can no longer simply prove himself by playing better than Jeong-yo.
The old contest may no longer exist.
And perhaps that is exactly what Bi-o needs.
For the first time, he may be forced to see Jeong-yo not as an opponent to defeat, but as another musician whose life was also damaged by the past.
The Cruel Irony of Bi-o and Jeong-yo
The greatest irony may be that both young men are victims of the same rivalry.
Bi-o suffers because he believes Jeong-yo has everything he wants.
Natural talent.
Recognition.
Freedom in music.
Jeong-yo, meanwhile, eventually loses the very thing Bi-o envies most: his ability to continue his life as a pianist.
Bi-o spends years wanting Jeong-yo’s position.
Jeong-yo loses that position entirely.
Neither of them truly wins.
That may be why the title Four Hands matters so much.
Four-hands piano requires two players to share the same instrument.
They have to listen to each other.
They have to make space for each other.
Neither performer can simply dominate the entire keyboard.
Yet Bi-o and Jeong-yo are pushed toward exactly the opposite relationship.
Instead of playing together, they are taught—directly or indirectly—to measure themselves against each other.
The tragedy is not that one is talented and the other works hard.
The tragedy is that two gifted musicians become incapable of seeing each other without competition standing between them.
Bi-o’s Real Battle May Still Be Ahead
Bi-o’s final opponent may not be Jeong-yo.
It may be himself.
Can he play music without needing to prove that he is better than someone else?
Can he accept his grandfather’s recognition without depending on it?
Can he look at Jeong-yo without seeing his own inadequacy?
And most importantly, can he understand that another person’s talent does not diminish his own?
If Bi-o cannot answer those questions, defeating Jeong-yo would never have saved him.
There would always be another rival.
Another competition.
Another musician receiving applause.
Another reason to feel threatened.
That is why Seung-woon’s warning feels increasingly important.
The person who becomes completely devastated may not be the person who loses the competition.
It may be the person who can no longer imagine himself without it.
Final Thoughts
So why does Bi-o hate Jeong-yo so much?
Because Jeong-yo represents far more than a rival pianist.
He represents Bi-o’s fear that hard work may not be enough.
He represents the grandfather’s recognition Bi-o desperately wants.
He represents natural talent Bi-o cannot simply acquire through more practice.
And most painfully, he represents the moment Bi-o feels that his grandfather looked at two young musicians and chose someone else.
That is why Bi-o cannot simply ignore him.
But the deeper tragedy of Four Hands may be that Jeong-yo was never truly Bi-o’s enemy.
Bi-o’s real enemy is the belief that he can only prove his own worth by defeating someone else.
And if Kang Seung-woon already understood where that obsession would lead, then his warning about someone becoming completely devastated may be far more important than it first appeared.
The next question is therefore unavoidable:
When Seung-woon warned that one of them would end up completely destroyed, was he talking about Bi-o all along?