Urban Legend Hunters - The Baby Ghost- summary:

Someone at school is worshipping a baby spirit! In order to prevent young love from running rampant, the school implemented a “dating ban.” This created a very tense atmosphere at school. Yangda, a high school boy, believes that there are secrets behind every urban legend. In order to find out who is pretending to be a ghost, he decides to hold a ritual to summon baby spirits! However, he’s wrapped up in the ghastly crime at school…