The Boy Who Played Kim Tae Hee's Daughter Has Now Starred in 21 K-Dramas

In 2020, a five-year-old boy named Seo Woo Jin became one of the most talked-about child actors in Korean television history — not because of a scene-stealing tantrum or a perfectly timed tear, but because audiences had no idea he was a boy at all. Cast as the daughter of Kim Tae Hee in the tvN drama Hi Bye, Mama!, Seo Woo Jin delivered a performance so convincing that many viewers were genuinely shocked to learn the child playing the adorable Seo Woo was actually male.

Six years later, the now ten-year-old has quietly built one of the most impressive resumes in Korean child acting. With 21 K-drama credits to his name, two acting awards, and a current role in the MBC legal drama The Judge Returns, Seo Woo Jin has not only survived the scrutiny that accompanied his breakout role — he has thrived beyond it.

The Role That Started Everything

Hi Bye, Mama! tells the emotionally charged story of Cha Yu-ri, played by Kim Tae Hee, a woman who dies in a tragic accident but is given 49 days to return as a ghost and reconnect with her husband and young daughter. The casting of Seo Woo Jin as her daughter was deliberate — the production team reported that among all the child actors they auditioned, he bore the closest physical resemblance to Kim Tae Hee and demonstrated the most stable acting ability for his age.

The revelation that the adorable child was a boy sparked a wave of online commentary. Some viewers expressed concerns about potential confusion regarding gender identity, while others simply marveled at how seamlessly the young actor had disappeared into the role. The discourse grew heated enough that Seo Woo Jin's mother took to Instagram to address the criticism directly.

In a firm but measured post, she wrote that her son understood perfectly well what he was doing and why he was playing the role of a girl. She pushed back against what she called unnecessary prejudice and overreach, emphasizing that Woo Jin was a masculine boy who preferred being called handsome over cute. Kim Tae Hee herself publicly praised the young actor, noting his natural talent and professionalism on set.

From Controversy to Award-Winning Career

Rather than being defined by the gender controversy, Seo Woo Jin channeled the attention into a prolific career that has spanned some of the most popular K-dramas of recent years. His breakthrough continuation came with KBS Young Lady and Gentleman, a daily drama that aired from 2021 to 2022 and became a ratings phenomenon. In this series, Seo Woo Jin played a sharply written child character that showcased his growing range, earning him two acting awards — a remarkable achievement for an actor who was barely seven years old at the time.

The young actor has since appeared in a string of notable productions, amassing 21 K-drama credits that include both daily dramas and prime-time series. His ability to deliver consistent, emotionally resonant performances has made him one of the most sought-after child actors in the Korean entertainment industry. Notably, he has not taken any female roles since Hi Bye, Mama!, allowing his body of work to speak entirely on the strength of his acting talent.

Life Beyond the Camera

Despite his packed filming schedule, Seo Woo Jin has maintained a life that looks remarkably normal for a child his age. He is an active ice hockey player, a hobby that underscores the athletic, energetic personality his mother described during the Hi Bye, Mama! controversy years ago. His Instagram account, managed by his mother, reveals a well-rounded child who balances acting commitments with school life and sports.

The young actor has also built a secondary career in modeling, working with children's clothing brands that have recognized his appeal to young audiences and parents alike. His public appearances at awards shows have drawn attention for his poised demeanor, and he has been photographed meeting K-pop artists like BTOB, suggesting a comfort with the entertainment industry that belies his age.

Currently Filming The Judge Returns

Seo Woo Jin's most recent project is the MBC drama The Judge Returns, a legal drama that represents another step forward in his career. Working alongside veteran actors in a genre that demands emotional nuance and precise timing, the role demonstrates the trust that casting directors now place in his abilities. The drama has been performing steadily in ratings, and Seo Woo Jin's scenes have drawn particular praise from viewers who remember the wide-eyed child from Hi Bye, Mama!

The trajectory of his career offers an interesting case study in how child actors navigate the Korean entertainment landscape. Unlike many child stars who fade from view after an initial burst of fame, Seo Woo Jin has maintained a remarkably steady upward arc. Each new role has expanded his range, and the sheer volume of his work — 21 dramas in six years — suggests an actor and a family who have found a sustainable approach to balancing childhood with a demanding profession.

A Growing Legacy

Looking at the journey from the five-year-old in pigtails who made audiences cry alongside Kim Tae Hee to the confident ten-year-old holding his own in legal dramas, Seo Woo Jin's story is one of quiet resilience. The controversy that marked his debut has long since been overshadowed by the simple, undeniable fact of his talent. With each new drama credit added to his growing filmography, he moves further from being defined by a single casting decision and closer to being recognized as one of the most accomplished child actors of his generation.

As he continues to grow both physically and as a performer, the Korean drama industry appears ready to grow with him. The boy who once pretended to be a girl on television has become something far more interesting — a young actor whose career is being built on skill, consistency, and the kind of natural screen presence that cannot be taught. Whatever roles await Seo Woo Jin in the years ahead, his first decade in the industry has already written a story worth telling.