In Sangwoo Choo’s ideal world, Jaeyoung is a grammatical mistake. Sangwoo is a rule follower. As a result, when his classmates take advantage of a group effort, he doesn’t give them credit. However, this prohibits Jaeyoung Jan – his senior, from graduating. Sangwoo and Jaeyoung are like oil and water that couldn’t be mixed. Can Sangwoo fix Jaeyoung, a lexical flaw in an otherwise perfect life?