Back in his high school days, Joon-Seok (Joo Sang-Wook) was bullied by Chang-Sik (Yang Dong-Geun). Because of this, Joon-Seok’s high school days were like a nightmare. Now, Joon-Seok finds it difficult to live a normal life due to the bullying. Meanwhile, Chang-Sik, who has forgotten what he did to Jeon-Seok, lives a relatively happy life. He is about to marry Ji-Hee (Lee Tae-Im). Joon-Seok will pay him back for all the misery.

is a story about elite high school seniors, the top 1%, who are prepared to go to extremes to get into prestigious universities. A student who has ranked number one at an esteemed school dies in a remote mountain. Finding out why and the ultimate impact of his death make up the bulk of this thriller’s elaborate narrative, whose shocking conclusion could lead us to comment, “We’ve seen a devil.” Despite a structure that freely weaves together past and present, and a cast of appealing actors including Lee David, Gung Jun and Kim Kkot-bi, the most remarkable thing about the film is the theme itself. It touches on and raises the critical issue of the demands of Korea’s education system, which are becoming more extreme and competitive by the day.

On a live music radio show, a letter arrives from the 23 years in the past. Through the letter, the first love and friendships of five friends are revealed.