Na-mi and Sun-woo, who have been suffering from bullying and school violence throughout their school days, attempt suicide while their classmates go on a school trip. After the silly yet ridiculous suicide failure, the two try to take revenge on Chae-rin, who bullied them most and now lives happily in Seoul. However, their plans go awry. Ridiculously, Chae-rin, the worst bully ever, has found religion and has turned into a genuinely good person. What should they do now?