Semantic Error

You're an error in my perfect world. Sang-U Chu 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, Jae-Yeong Jang, from graduating. And like oil and water, Sang-U and Jae-Yeong don't mix. Can Sang-U debug Jae-Yeong — a semantic error in his perfect life? (Source: Manta, edited) Note: Chapter count includes a Christmas Special.