She began her career in Jang Jin's stage plays, and for a few years appeared in supporting roles on film and television.

Lee began her career in playwright/filmmaker Jang Jin's stage plays, then appeared in the Christian-themed indie Pruning the Grapevine,[1] while doing minor roles on film and television.

Lee's breakout role was in romantic comedy Cyrano Agency in 2010, where she swept Best New Actress awards at various local award-giving bodies.

[11] She successfully carried the film, with one review praising her as "expertly swinging from girly ditz, through self-centered pop diva (with memorable temper tantrums), to serious singer-songwriter.

"[11] After playing a disillusioned fiancée to an ambitious fund manager in Midas,[14] Lee returned to the romantic comedy genre in the body-swapping TV series Big written by the Hong sisters.

[16] This was followed by Cunning Single Lady in 2014, in which she played the titular character who schemes to win her ex-husband back now that he's rich and successful.