I'm Going to Substitute Attendance at High School

Introduction to the Work: Eunsoo was enjoying his freedom after being discharged from the military when his mother's order came down. He was to attend high school in place of his younger sister, a sophomore who couldn't return to Korea for the start of the semester. It's a ridiculous plan... but it's actually working? He put his bewildered feelings aside and safely completed his attendance, but his relief was short-lived. "Do you really think the two of you look alike?" He was caught by a guy who was his sister's senior. The one who figured out Eunsoo's identity was Kang Haneul, a third-year student. In school, he's an arrogant punk... "Hey, this is my house!" "Ah, I don't know. I'...