Abyss

Jun Jung was a bystander who watched his classmates bully Soorim Sung, a student who transferred to Bukak High School at the start of his second year. Although Jun never participated in the bullying, he also never did anything to help stop it. Six months later, Jun’s class was picked for Abyss—an escape room on a ship. Jun and his classmates couldn't be more excited, but their excitement soon turns into fear when they realize the person behind Abyss is out for blood…

(Source: Tapas)