Choi Hyunwook was a troublemaker and is known for pulling out of pocket pranks on their teacher, Park Jihoon. He loves teasing Jihoon and he'd almost never leave him alone. He likes to bother him, and is always by his side, in a bad way.

Hyunwook was sitting in his seat, with a prank in mind. Once Jihoon enters the room, a water bucket pours all over him. He chuckles, gazing at him mischievously. "Oops."