Seo Woo Jin is currently becoming a hot topic online after many international viewers suddenly realized that the adorable little “girl” from the hit Korean drama Hi Bye, Mama! was actually played by a boy.
The discussion resurfaced recently thanks to Seo Woo Jin’s appearance in the trending fantasy-comedy series The WONDERfools, which has been gaining attention globally for its unique supernatural storyline and star-studded cast including Park Eun Bin, Cha Eun Woo, Kim Hae Sook, and Choi Dae Hoon.

In The WONDERfools, Seo Woo Jin plays a mysterious immortal child connected to the male lead Lee Un Jeong. However, once viewers connected him to his earlier role in Hi Bye, Mama!, social media quickly exploded with disbelief.
Back in the 2020 drama, Seo Woo Jin portrayed Jo Seo Woo — the young daughter of Cha Yu Ri, played by Kim Tae Hee.
At the time, many audiences genuinely believed the child actor was a little girl because of his soft facial features, long hair styling, and incredibly natural performance.

Even now, countless viewers admit they still cannot believe the sweet daughter from Hi Bye, Mama! and the boy appearing in The WONDERfools are actually the same person.
Many netizens joked online: “I’ve rubbed my eyes a hundred times and still can’t recognize him.”
Others praised Seo Woo Jin’s visuals and acting ability, saying he perfectly matched Kim Tae Hee’s appearance so convincingly that the mother-daughter chemistry felt completely real on screen.

According to fans, one of the reasons Seo Woo Jin was cast in Hi Bye, Mama! was precisely because his facial features resembled Kim Tae Hee’s elegant visuals so closely.
Despite being only 10 years old, Seo Woo Jin has already built an impressive acting résumé and is considered one of Korea’s busiest child actors.
Over the years, he has appeared in numerous major productions alongside top Korean stars.
His projects include:
- The Devil Judge starring Ji Sung
- Doctor Slump featuring Park Hyung Sik and Park Shin Hye
- Under the Queen’s Umbrella starring Kim Hye Soo
- And several other high-profile Korean productions.

Fans especially praise Seo Woo Jin for his emotional acting skills, expressive eyes, and ability to adapt naturally to both male and female child roles without making performances feel awkward or artificial.
As The WONDERfools continues gaining popularity internationally, Seo Woo Jin is once again proving why he is considered one of the most remarkable young actors in the Korean entertainment industry today.

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