Lee Yeon first made her debut as an actress in 2018 with the South Korean film
Anonymous. She has appeared in several films and television series, including a cameo as the younger sister of the male lead
Jung Hae-in's character in the South Korean
Netflix drama
D.P. (2021). Lee's breakout role comes from 2022
Netflix drama
Juvenile Justice, in which Lee's character is a 13-year-old male teenager Baek Seong-woo, who was charged with murdering a young schoolboy in the drama's first two episodes. Despite being a female and her Korean age of 28 at the time she portrayed Seong-woo, Lee's acting and transformation as a cold-blooded murderer was positively reviewed and applauded by audiences and critics. Lee's performance in
Juvenile Justice allowed her to gain a "Best New Actress" award nomination by the
58th Baeksang Arts Awards, but the award was eventually given to
Kim Hye-jun. In 2025, Lee made a special appearance in the film
Good News ==Filmography==