ATEEZ’s San Was Once Told He Wasn’t Ready to Dance With the Others — What Happened?
Watch ATEEZ’s San today and this story sounds almost impossible.
A few seconds of his dancing can take over TikTok, YouTube Shorts and Instagram Reels.
His facial expressions are analyzed.
His fancams go viral.
People try to copy his moves.
But San was not always known as an extraordinary dancer.
In fact, when he first joined KQ Entertainment, he has said he barely knew how to dance.
And during one of his earliest monthly evaluations, he received news that hurt so much that he ended up crying while cleaning the stairs.
He Wasn’t Ready to Dance With the Others
San has told the story himself.
After his first monthly evaluation as a trainee, he learned that the other trainees were preparing BTS’s “Blood Sweat & Tears” for the next evaluation.
San wanted in.
He learned the choreography and was excited about practicing it with the others.
Then he was told something he didn’t want to hear.
He wasn’t ready to perform with them that month.
San later recalled that he normally wasn’t someone who cried easily.
But while cleaning after practice, he began sweeping the stairs.
And the tears came.
For anyone who only knows the San of 2026, that scene is difficult to imagine.
Today, people stop scrolling because San is dancing.
Back then, he wasn’t considered ready to dance beside the other trainees.
And Dance Wasn’t His Natural Starting Point
The story becomes even more surprising when you look at San’s early interviews.
In a 2019 interview with Dazed, shortly after ATEEZ’s debut, San admitted that he had struggled with confidence.
He said he didn’t know what he was good at.
Training meant constant vocal and dance lessons.
He remembered dealing with muscle pain every night.
But every morning, he tried to reset his thinking:
“I can do it.”
That sentence may explain San better than calling him naturally gifted.
He had something extremely useful for a trainee who was behind:
he knew he was behind.
And he kept working anyway.
Then Something Started to Change
Improvement in dance is rarely one dramatic moment.
It is repetition.
Angles.
Timing.
Balance.
Watching yourself again.
Finding what looks wrong.
Doing it again.
And again.
San gradually developed something beyond simply remembering choreography.
He learned how to perform.
His body became part of the storytelling.
His eyes became part of it.
His facial expressions changed with the character of a song.
And instead of trying to hide the intensity of his movement, he eventually turned that intensity into his signature.
Years later, that difference became impossible to miss.
The Trainee Who Couldn’t Join “Blood Sweat & Tears” Became the Performer People Came to Watch
There is an almost perfect irony in San’s story.
He once cried because he couldn’t perform BTS’s “Blood Sweat & Tears” with the others.
Later, ATEEZ performed that very song during their 2019 MAMA stage.
This time, San wasn’t watching from the practice room.
He was on the stage.
But even that feels small compared with what came later.
ATEEZ became known internationally for performance.
San became one of the members most closely associated with that reputation.
And then came “BAD.”
A Few Seconds Changed Everything
In 2026, San’s short chest-pop section in “BAD” exploded across short-form video platforms.
People copied it.
Dancers reacted to it.
Viewers who didn’t know ATEEZ began asking:
“Who is that guy?”
The irony is almost too perfect.
The trainee who once wasn’t considered ready to join a dance evaluation had become the person everyone was trying to imitate.
But “BAD” didn’t create San overnight.
It exposed the result of years of work to a much larger audience.
The Body Changed Too
San also deliberately built a body capable of supporting ATEEZ’s demanding choreography.
In a 2025 interview with GQ, he explained that he regularly trains his shoulders, legs, chest and back.
He said leg training made his feet feel “like feathers” when dancing.
In another interview, San explained that ATEEZ uses many powerful, large movements, so he trained his body to better match the group’s choreography.
That detail matters.
The physique people now notice in “BAD” is not separate from the performer.
It became another tool.
From Learning Dance to Helping Create It
And perhaps the biggest reversal came in 2026.
For ATEEZ’s “Adrenaline,” San didn’t simply receive choreography and perform it.
He participated directly in creating it.
The other members said San understood the direction the group wanted and helped shape the choreography accordingly.
Think about that transformation.
He entered the company barely knowing how to dance.
He was once told he wasn’t ready to perform a monthly evaluation with the others.
Years later, he was helping create choreography for ATEEZ.
That may be more impressive than any viral clip.
“BAD” shows what San can do.
His trainee story explains how much had to happen before he could do it.
Maybe San’s Most Impressive Talent Isn’t Dancing
Today, it is easy to watch San and assume this was inevitable.
Maybe he was simply born to perform.
Maybe he always had extraordinary dance ability.
His own story says otherwise.
There was a version of San who struggled.
A version who lacked confidence.
A version who swept practice-room stairs while crying because he wasn’t good enough yet.
That last word matters.
Yet.
Because the most surprising thing about San may not be how well he dances now.
It may be that there was once a time when he wasn’t considered ready to dance beside the others.
And instead of accepting that as his level,
he changed it.