[2] Kim debuted as an actress in the film Sorry, Thanks in 2011.

Since then, she has become an in-demand child actress in both independent and big-budget films like Sprout (2013) Mad Sad Bad (2014) and Coin Locker Girl (2015).

[3] In 2016, she gained wider recognition for playing the daughter of Gong Yoo's character in the box-office zombie hit Train to Busan.

The same year, she signed an exclusive contract with talent management agency Blossom Entertainment.

[4] In 2017, she starred in the action film The Battleship Island, playing Hwang Jung-min's daughter.