Compassion (2014)

Although Han Gong Ju is way darker this movie is pretty good and it gives a similar feeling overall and one of the guys of Han Gong Ju is in compassion

Both are about a teenage girl contemplating suicide after being singled out and bullied by her classmates.

Both about rape and bullying !
High school student Ha Na experiences trouble sleeping after her classmate Jin Ah committed suicide. Not being able to sleep, Ha Na sees her parents fighting. The next day, her parents act like nothing happened the night before. She doesn't like her parents hypocritical behavior. Around this time, Se Mi, a senior in the band club, approaches Ha Na. Ha Na begins to act differently, but she becomes to regret her behavior. A rumor spreads about her and she becomes the target of bullies.

Similar theme about bullying, both are good movies to my taste just that Pluto is a little better.