Jommeongneun Goemul

The confession was impulsive. Yoon's impulsive confession to Sang-Hyeok, whom he had a crush on, ended up being met with violence. Betrayed by Sang-Hyeok, whom he trusted, and made a scapegoat for the bullies, Yoon ultimately made an extreme choice...

The story of Sang-Hyeok, the model student class president who confides his true feelings in guilt, Soo-Young, the mysterious bully, and Yoon, who finds herself in a precarious position within their relationship.

(Source: Lezhin, translated)

Note: Includes four extra chapters.