Cover The latest K-drama baby fans are obsessing over is baby Woo-ju of ‘Our Universe’ (Photo: tvN)
The latest K-drama baby fans are obsessing over is baby Woo-ju of ‘Our Universe’ (Photo: tvN)
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These K-drama babies are guaranteed to impress audiences…and trigger their cuteness aggression
K-dramas have long excelled at tugging at viewers’ heartstrings, but some of the most unforgettable, scene-stealing moments come from the smallest cast members. From gummy-smiled toddlers who unknowingly play cupid to precocious child actors whose performances are impossible to ignore, these pint-sized talents prove that remarkable acting knows no age limit.
Whether charming audiences with their antics or adding emotional depth beyond their years, these tiny stars quickly became beloved parts of their shows. Here are some of the most adorable and talented K-drama babies and child actors who captured hearts along the way.
In case you missed it: 10 K-drama couples fans want to see reunite on screen
‘Our Universe’ (2026)
Above K-drama’s Baby Woo-ju is all our universe now
When baby Woo-ju’s parents die in a tragic car accident, he is left in the care of two reluctant guardians: his mum’s younger sister Woo Hyun-jin (Roh Jeong-eui), who is clearly in over her head, and his father’s estranged brother Sun Tae-hyeong (Bae In-hyuk), who would much rather not be involved at all.
Co-parenting—and forced cohabitation—does not come easily to the accidental in-laws, especially when responsibility is thrust upon them overnight. Yet at the centre of their uneasy arrangement is 20-month-old Seon Woo-ju, whose gummy smiles and chocolate-streaked cheeks slowly soften hardened hearts. Unwittingly playing cupid, Woo-ju becomes the bridge between Hyun-jin and Tae-hyeong, and before long, a reluctant partnership turns into romance.
The tiny scene-stealer is played by Park Yoo-ho, whose expressive face is so adorable that some viewers even wondered if he was an AI-generated baby. Behind-the-scenes clips quickly put those rumours to rest, revealing a very real toddler who shares an especially sweet off-camera bond with Bae In-hyuk.
‘Hi Bye, Mama!’ (2020)
Above Seo Woo-jin was cast in part thanks to his resemblance to onscreen mum Kim Tae-hee
In this meditation on grief and loss, the ghost of Cha Yu-ri (Kim Tae-hee) is sent back to Earth and given 49 days to reclaim her old life. She spends much of this time watching over and protecting Jo Seo-woo, the baby she left behind. In the process, she learns that sometimes letting go is the greatest act of love.
Much of the drama’s emotional weight rests on the tiny shoulders of the child playing her daughter, whose sweet presence tugs at the heartstrings. What most audiences didn’t know at the time is that Seo-woo is actually played by a young male actor—Seo Woo-jin, who was cast as much for his talent as for his striking resemblance to his onscreen mom, Kim Tae-hee.
See more: 9 heartwarming K-drama families to make you call your relatives at Christmas
‘Hospital Playlist’ (2020)
Above Cho Jung-seok and Kim Jun had the perfect father-and-son chemistry in ‘Hospital Playlist’ (photo: tvN)
Cho Jung-seok and Kim Jun had the perfect father-and-son chemistry in ‘Hospital Playlist’ (photo: tvN)
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As Woo-joo, the young son of Lee Ik-joon (Cho Jung-seok) in Hospital Playlist, Kim Jun captured the hearts of fans around the world. More than his cute face and even cuter bowl cut, what caught the attention of fans was the young actor’s comedic timing and effortless chemistry with Cho Jung-seok. The pair brought a believable father-and-son dynamic to the screen that provided moments of levity and tenderness.
‘Family By Choice’ (2024)
Above Fans would have watched an entire K-drama of the characters’ childhood years thanks to these three stars
The first few episodes of the chosen-family K-drama feature Oh Eun-seo, Choi Jae-yoon and Shin Seo-woo—a trio of talented young actors who portray the younger versions of the main leads. Their natural performances and easy on-screen chemistry left such a strong impression that many viewers found themselves wishing for an entire drama devoted solely to the characters’ childhood years.
Oh Eun-seo is a particular standout—and with 16 acting credits already to her name, it's clear she is well on her way to becoming a seasoned performer
‘Love Next Door’ (2024)
Above Oh Eun-seo and Jo Yeo-joon look just like their adult counterparts in ‘Love Next Door’ (Photo: IMDb)
Oh Eun-seo and Jo Yeo-joon look just like their adult counterparts in ‘Love Next Door’ (Photo: IMDb)
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Alongside Oh Eun-seo—who gave a memorable performance as the younger version of Jung So-min's character—the drama cast Jo Yeo-joon as the young Jung Hae-in. It was a pitch-perfect choice: both young actors convincingly mirrored the mannerisms and emotional beats of their adult counterparts, making the transition between timelines feel seamless.
Jo Yeo-joon made such a distinct impression that viewers later recognised him instantly in his brief but striking appearance in The Frog, proving that even limited screen time was enough to cement his presence in audiences’ minds.
‘Reply 1988’
Above The baby from ‘Reply 1988’ is all grown up
Another young performer who stole audiences’ hearts was Kim Seol, who played Jin-joo in Reply 1988. Affectionately dubbed the “Eating Fairy” by fans (she was often featured snacking), she became a beloved fixture in the neighbourhood and a quiet scene-stealer in her own right.
When the cast reunited for the drama’s 10th anniversary special last year, both the actors and longtime viewers were moved to tears at the sight of the once-tiny Jin-joo all grown up—a poignant reminder of just how much time has passed since the series first captured hearts.
These young performers may have had limited screen time, but their impact was anything but small. In the world of K-drama, it seems, stealing hearts is not reserved for the leads alone.
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Maggie Adan is a content writer, editor, and strategist with extensive experience across print, digital, and social media publishing. Formerly editor-in-chief at K-Zone Philippines, Summit Books and Content Lab, she has written lifestyle stories covering everything from entertainment and travel to beauty and wellness. A storyteller at heart with a keen editorial eye and a passion for narrative, she contributes to various publications and helps brands create and curate content for their social media platforms.
