2026 new year movie season brings cheerful energy and laughter with the film "Heartman" (director Choi Won-seop, provided/distributed by Lotte Entertainment, produced by MovieRock, Like M Company), whose lead actors Kwon Sang-woo and Kim Seo-heon are receiving praise for their unprecedented chemistry.
In the 2026 new year movie season, the film "Heartman," which is delivering happy energy to theaters, revealed the true identity of Seung-min's unspeakable secret. That identity is the character So-young, played by actor Kim Seo-heon. So-young is Seung-min (Kwon Sang-woo)'s daughter and an unpredictable force in his daily life, and the father-daughter chemistry between the two is a key point that carries both the rhythm and the laughter of the film "Heartman."
As seen in the released stills, actor Kim Seo-heon showed a variety of charms as So-young. Along with a bright smile and clear eyes that conveyed confident energy, she displayed playful mischief and competitive expressions that draw you in, a composed gaze and subtle emotional expressions not seen in young children, enriching the film "Heartman." Through Seung-min's daughter So-young, Kim Seo-heon convincingly built not only precise comic timing but also emotional depth, raising the film's completeness as a "chemistry cheat code" with Kwon Sang-woo. Audiences who watched the film commented, "The child actor So-young was so funny I enjoyed it" (Naver_danc****), "It was really fun after a long time; it had both emotion and humor. The child actor's performance was so good I was drawn in" (Naver_yj11****), "Moon Chae-won was legendary and So-young was so cute" (Naver_reds****), "A child actor leads and reliable veterans complete it" (CGV_KCWorld), "The child actor in the role of daughter So-young had a truly impressive performance. Heartman made me think a lot about the protagonist's situation" (CGV_BraveRonWeasley12569), "A fun movie to relieve stress, I laughed a lot. Especially the child actor acts well, good good" (CGV_PeacefulSmurf14016) — among other comments. With concentration and a sense of timing that make it hard to believe she is a child actor, she has firmly stamped her mark on "Heartman" audiences, and her future steps are increasingly anticipated.
The film "Heartman," which showcases the performance of actor Kim Seo-heon who completed the balance of laughter and emotion, is a comedy about Seung-min (Kwon Sang-woo), a returned man who struggles to not lose his reunited first love but faces an absolute secret he cannot tell her, and it is now being screened nationwide.
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