Choo Young-woo: the actor who kept going after 100 nos

Choo Young-woo is a South Korean actor born on June 5, 1999 (Gemini, Earth Rabbit). He is 27, about 186 cm (6 ft 1 in), and represented by J,Wide Company.

A lot of people met him first as Yang Jae-won, the earnest junior doctor in Netflix’s The Trauma Code: Heroes on Call. Others are meeting him now in Between Steps, the late Ahn Pan-seok’s final romance on Disney+ and Hulu. Either way, the rise can look abrupt. It was not. Before the awards and the global charts, there was a rejected idol offer, a family move for acting school, and a stretch of failed auditions he has talked about with unusual honesty.

Growing up around models

His parents, Choo Seung-il and Kang Sung-jin, were both models. His father was one of the recognizable male faces on Korean runways in the 1990s. His younger brother, Cha Jung-woo, later became an actor too, and even stood in as Choo’s body double when The Tale of Lady Ok needed two versions of him on screen at once.

In high school, JYP Entertainment approached him about becoming an idol. He said no. On You Quiz on the Block, he explained it simply: what he enjoyed was impersonations, voice work, and copying other people. That pointed toward drama school, not a trainee dorm.

His family moved from Sejong to Seoul so he could train properly. The road into the Korea National University of Arts was messy. He has said he first got into Sejong University, then lost the seat after missing a tuition deadline, and that the disappointment briefly took the air out of him. He reapplied, got into K-Arts among other options, and chose it. He is still listed as on leave while he works.

Debut years and the long no

He debuted in 2021 in the web series You Make Me Dance, as a contemporary-dance student short on money and family support. Broadcast work followed in Police University and School 2021. KakaoTV’s Once Upon a Small Town and KBS’s Oasis gave him steadier leading space. Early prizes arrived quietly: an APAN webseries award for Once Upon a Small Town, then Best New Actor at the 2023 KBS Drama Awards for Oasis.

What he remembers more clearly from that period is the rejection. From 2021 to 2022, he later estimated, he went to about 100 auditions. The list included big titles such as Under the Queen’s Umbrella, The Penthouse, D.P., and Black Knight. He did not book them. Casting people asked if he was really from K-Arts. His father, not unkindly, suggested a backup plan in case acting did not pay. Choo has said his answer was that he would act until he died, money or not.

That stretch is useful to keep in the biography. The later year looks less like magic when you know how many rooms had already closed.

Lady Ok, then Trauma Code

JTBC’s The Tale of Lady Ok (2024–2025) was the first role that made a wider industry sit up. Opposite Lim Ji-yeon, Choo played dual parts that needed different posture, voice, and gaze inside the same show. In May 2025, that work won him Best New Actor in television at the 61st Baeksang Arts Awards.

Netflix’s The Trauma Code: Heroes on Call is what carried the name outside Korea. As Yang Jae-won, a colorectal fellow pulled into Ju Ji-hoon’s blunt trauma unit, he played someone capable and still scared: helicopter rescues, hospital politics, and a junior who wants to do well without looking foolish.

The series topped Netflix charts in multiple territories in early 2025. He later won Best New Actor at the Blue Dragon Series Awards for the same role. On talk shows he has spoken warmly about Ju as a leader on set, the kind of senior who kept the room laughing even when the material was heavy.

A crowded 2025, then a quieter turn

He did not pause after the medical drama. In Mercy for None, opposite So Ji-sub, he played Lee Geum-son, a Seoul prosecutor whose ambition sits under a polished surface. On tvN and Prime Video, Head Over Heels brought him back together with School 2021 co-star Cho Yi-hyun for a fantasy romance about bad luck and a student shaman. On Christmas Eve 2025 he made his theatrical debut in Even If This Love Disappears From the World Tonight, a memory-loss romance with Shin Si-ah that Netflix released worldwide in February 2026.

Between Steps, which premiered Oct. 5, 2026 on ENA and on Disney+ and Hulu in North America, asks for a different tempo. Choo plays Park Min-jae, a robotics doctoral student who lost a leg to osteosarcoma and puts falling in love on a bucket list he is almost too careful to start. He worked with a prosthetic consultant so the walk and small daily habits would feel ordinary rather than performed. Our premiere piece has more on the Ahn Pan-seok context and his pairing with Kim So-hyun.

Next is Netflix’s Long Vacation, directed by Lee Jung-hyo of Crash Landing on You, with Choo as Demon 3375 opposite Lee Se-young. Filming was underway by spring 2026. A release date has not been set.

Where to start

If you want the performance that made him familiar abroad, start with The Trauma Code: Heroes on Call. For the Baeksang dual-role work, watch The Tale of Lady Ok. For the slower, more careful version of him, try Between Steps.

What holds the career together is not a single type. He has been the soft junior doctor, the cold prosecutor, the unlucky fantasy boyfriend, the cautious grad student, and soon a demon who does not understand love. The through-line is simpler: after enough rejection, he treats each new role like a chance he nearly missed.