A diligent student, Oh Ji Soo (Kim Dong Hee) aims for enrolling Korean prestigious universities while living all alone. To make ends meet, he secretly runs a security service for sex workers and has been successfully earn savings for his dream. However, his job is at risk of being exposed when his classmate Bae Gyuri (Park Ju Hyun) steals his work phone and starts blackmailing him.

This is one of a rare crime-thriller school drama executed to the best of its potential. Every element that makes a show GREAT are there! Powerful acting, crisp filmmaking, high-intensity OSTs, engaging metaphors and thrilling character arc. A roller coaster of emotions jam-packed in 10 short episodes! The story is dealing with controversial topics without being explicit nor shaming them, as well as study pressure that all students face.

The first few episodes might feel a bit slow, but they were intriguing and unsettling. Then the second half was like a bullet train wreck, with me entirely in the passenger seat, constantly feeling a strong tension. Lots of daring awesome action scenes: cars exploding, fist fights, students go and trash a karaoke bar! XD Ji Soo’s PTSD-induced nightmares are some of the most thought-provoking and memorable scenes, really showed how bleak the situation he’s gotten into. Thanks Kim Dong Hee for being a really engaging Ji Soo!

It ended on a strong climax, and I have no complaint regarding the “slightly open for interpretation” ending. The story felt sufficient, concluded, and it has clearly delivered the message it says in the poster, that “Some mistakes can not be erased.”