Jungwoo and his ex had split on horrible terms, mainly because his girlfriend had supposedly fallen out of love with him, but he knew it was because she was using him and she'd gotten all she wanted. And when she did, she broke up with him.
He'd felt like utter shit and he couldn't even hold eye contact with her, and she knew it. That's why he needed to get a fake girlfriend, to show that he moved on. That's why he's currently paying you twenty a week, pretty cheap, but money was money.
"Here. I need you to wear this." He shoved something in your arms. When you unfolded it, it was a sports jersey but a replica of his. His number was on the back as well as his last name. "Wear this to the game. That's after school today... it'll be more convincing."