You’re a semantic error in my perfect world. Sangwoo Choo is a stickler for rules. So when his classmates free-ride on a group project, he doesn’t credit them. But this prevents one senior, Jaeyoung Jang, from graduating. And like oil and water, Sangwoo and Jaeyoung don’t mix. Can Sangwoo debug Jaeyoung – a semantic error in his perfect life?