Hail to Hell (Blu-ray) Korean w/English subtitles

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?