Warning: Major spoilers for the ending of Netflix’s Our Sticky Love below.
One of the biggest twists in Our Sticky Love comes very late in the story:
Baek Sang-gil is Jang Tae-ha’s biological father.
But the twist creates an even bigger question.
Does Tae-ha ever find out?
The answer is surprisingly painful.
No. Tae-ha never learns that Baek Sang-gil is his biological father.
Sang-gil discovers the truth shortly before his death, but he never tells Tae-ha.
That means Tae-ha spends years working under his own father, fights him in the final confrontation, watches him die — and still never knows who the man really was.
The Short Answer
Baek Sang-gil is Tae-ha’s biological father.
Sang-gil eventually realizes this after seeing old photographs of Tae-ha and his mother at Tae-ha’s grandmother’s home.
But Tae-ha himself never discovers the truth.
Sang-gil dies without telling him.
So by the end of Our Sticky Love:
Sang-gil knows Tae-ha is his son.
Tae-ha does not know Sang-gil is his father.
That is one of the finale’s cruelest ironies.
How Is Baek Sang-gil Tae-ha’s Father?
Before becoming the powerful criminal figure we meet in the series, Baek Sang-gil had a very different life.
He was involved in boxing and had a relationship with Tae-ha’s mother.
But Sang-gil eventually chose a darker path.
When Tae-ha’s mother became pregnant, Sang-gil refused to take responsibility for the child.
He offered money, but Tae-ha’s mother rejected the idea of raising her son with money connected to Sang-gil’s criminal life.
Sang-gil walked away.
That child was Jang Tae-ha.
The extraordinary part is that neither father nor son realizes their relationship when their lives cross again years later.
Sang-gil Spent Years With His Own Son Without Knowing It
This is what makes the twist much more tragic than a simple surprise reveal.
Tae-ha eventually ends up working for Sang-gil’s organization.
Sang-gil uses Tae-ha as one of his men.
Tae-ha follows his orders.
Eventually, Tae-ha turns against him in order to protect Eun-sae.
All that time, Sang-gil is dealing with his own son.
And neither of them knows it.
Some ending recaps describe Tae-ha as having worked under Sang-gil for around 14 years.
Think about what that means.
Sang-gil abandoned his child before becoming part of his life again without even recognizing him.
The father who refused to raise Tae-ha ultimately became one of the darkest influences on Tae-ha’s adult life.
When Does Sang-gil Realize Tae-ha Is His Son?
The truth finally reaches Sang-gil during the finale.
After escaping custody, Sang-gil goes to the village and takes Tae-ha’s grandmother hostage.
His intention is revenge.
He wants Tae-ha to come to him.
But inside the house, Sang-gil sees photographs connected to Tae-ha’s childhood and mother.
That is when the pieces finally come together.
The woman from his past.
The baby.
Tae-ha.
Sang-gil realizes that the man he has been using, threatening and ultimately trying to kill is actually the son he abandoned.
And the realization comes far too late.
Why Doesn’t Sang-gil Tell Tae-ha?
This is where the finale becomes more about interpretation.
The series clearly shows Sang-gil learning the truth.
But it does not give us a long speech in which he explains exactly why he chooses not to tell Tae-ha.
His actions give us the answer instead.
When Tae-ha arrives, the confrontation continues.
Tae-ha eventually has Sang-gil at gunpoint.
But Tae-ha still has no idea that the man standing in front of him is his father.
Sang-gil now knows something Tae-ha doesn’t.
If Tae-ha kills him, Tae-ha will not only become a killer.
He will unknowingly kill his own biological father.
Sang-gil does not allow that to happen.
Why Does Baek Sang-gil Kill Himself?
Sang-gil takes the gun and turns it on himself.
It is important not to interpret this as the series suddenly forgiving everything he has done.
Sang-gil remains responsible for enormous suffering.
He abandoned Tae-ha and his mother.
He chose crime.
He manipulated and hurt people.
He tried to eliminate Eun-sae.
And he helped create the violent world that Tae-ha spent years trapped inside.
Discovering that Tae-ha is his son does not erase any of that.
But his final decision appears to do one thing:
It prevents Tae-ha from becoming his killer.
For perhaps the first time, Sang-gil makes a decision that protects his son rather than harms him.
And Tae-ha never knows it.
Did Tae-ha Kill His Father?
No.
This is worth making completely clear.
Tae-ha does not kill Baek Sang-gil.
Although Tae-ha confronts him with the gun, Sang-gil ultimately takes control of the weapon and kills himself.
So Tae-ha neither knowingly nor unknowingly kills his biological father.
Sang-gil makes that choice himself.
Why Doesn’t Tae-ha Learn the Truth After Sang-gil Dies?
This is the question that has frustrated some viewers.
Surely someone could tell him later?
But the series ends without showing Tae-ha learning the truth.
There is no final letter from Sang-gil.
No confession.
No DNA revelation.
No relative arrives to explain everything.
The information effectively dies with Sang-gil.
That choice is unusual because K-dramas often use a hidden-parent reveal to create a huge emotional confrontation between parent and child.
Our Sticky Love does the opposite.
The audience gets the revelation.
Sang-gil gets the revelation.
Tae-ha does not.
Why Would the Writers Keep the Truth From Tae-ha?
This may be the most interesting part of the ending.
If Tae-ha learned that Sang-gil was his father, his entire emotional ending would change.
He would have to process the fact that the criminal who controlled so much of his life was also the father who abandoned him.
He might feel anger.
Grief.
Confusion.
Guilt.
Perhaps even an obligation to understand or forgive Sang-gil.
Instead, the drama refuses to place that burden on him.
Sang-gil has to confront what he did.
Tae-ha does not have to carry Sang-gil’s guilt.
The Father Tae-ha Never Knew vs. the Family That Raised Him
This leads to one of the finale’s strongest ideas.
Our Sticky Love repeatedly asks what actually makes someone family.
Sang-gil is Tae-ha’s father by blood.
But blood alone did not make him a father.
He abandoned Tae-ha.
By contrast, Go Yeong-hong raised Tae-ha even though they were not biologically related.
She gave him a home.
She protected him.
She became his family.
The finale then takes the idea even further.
Tae-ha eventually builds a new family with Eun-sae.
So the ending gives us two completely different definitions of family.
Sang-gil represents blood without love.
Tae-ha’s grandmother and Eun-sae represent love without needing blood.
That may explain why Tae-ha never needs the biological revelation to complete his story.
Why Sang-gil’s Death Is More Tragic for the Audience Than for Tae-ha
There is a clever imbalance in the finale.
We know something Tae-ha doesn’t.
When Sang-gil looks at Tae-ha during their final confrontation, we understand what that look means.
Tae-ha doesn’t.
When Sang-gil chooses to die rather than allow Tae-ha to kill him, we understand another layer of that decision.
Tae-ha doesn’t.
And when Tae-ha moves forward with his life afterward, we know that he has just lost the only chance to hear the truth directly from his biological father.
Tae-ha doesn’t know that either.
That dramatic irony is what gives the twist its emotional power.
Did Sang-gil Love Tae-ha?
This is harder to answer.
For most of Tae-ha’s life, Sang-gil certainly does not behave like a loving father.
He abandoned him before birth.
Later, without knowing their relationship, he treats Tae-ha as someone useful to his criminal organization.
So it would be misleading to rewrite Sang-gil as a secretly devoted father.
But something changes when he discovers the truth.
His final action suggests regret.
Perhaps guilt.
And perhaps, finally, some form of paternal instinct.
The tragedy is that it arrives at the last possible moment.
Too late to raise Tae-ha.
Too late to repair anything.
Too late even to tell his son:
I am your father.
Does Eun-sae Know Sang-gil Is Tae-ha’s Father?
The finale centers the revelation on Sang-gil and the audience rather than giving Tae-ha a later discovery scene.
The important point for the ending is that Tae-ha himself remains unaware.
That is why his final life with Eun-sae is not shaped by a dramatic reconciliation with his biological father.
His story moves forward instead.
Why the Ending Still Gives Tae-ha Closure
At first, it may seem unfair.
Tae-ha has wondered about his father.
And after all that, he never gets the answer.
But the drama gives him another kind of closure.
He visits his mother’s grave with Eun-sae.
He moves beyond the criminal world that defined so much of his life.
He chooses the person he loves.
He proposes.
And eventually Tae-ha and Eun-sae marry surrounded by the people who have become their family.
The series therefore does not complete Tae-ha’s story by revealing where he came from.
It completes his story by showing where he chooses to go next.
Why This Twist Matters
The father reveal is not simply there to shock viewers.
It completes the contrast between Tae-ha and Sang-gil.
Sang-gil allows his past and his choices to destroy his life.
Tae-ha comes from Sang-gil — but does not have to become him.
That may be why Sang-gil’s final decision matters.
He cannot undo abandoning his son.
He cannot undo the crimes he committed.
He cannot become the father Tae-ha deserved.
But he can prevent Tae-ha from repeating one final act of violence.
Sang-gil ends his own story.
Tae-ha gets to continue his.
Final Takeaway
So, does Jang Tae-ha ever find out that Baek Sang-gil is his biological father in Our Sticky Love?
No.
Baek Sang-gil discovers the truth during the final confrontation after recognizing Tae-ha’s connection to the woman and child from his past.
But he never tells Tae-ha.
Instead, when Tae-ha is on the verge of killing him, Sang-gil takes the gun and kills himself.
Tae-ha watches his biological father die without ever knowing who he really is.
It sounds cruel.
But there may be a reason the drama leaves Tae-ha in the dark.
Our Sticky Love ultimately argues that family is not defined only by the person whose blood you carry.
Tae-ha never learns the identity of his biological father.
But by the ending, he knows exactly who his real family is.
And perhaps that is the answer the drama considers more important.