Serim's Iron Rule

Han Saerim, feared by everyone due to rumors that he's in a gang. "Mom's friend's son" Kang Seungwoo ends up in a mentor-mentee program with Saerim and attempts to get close to him in order to carry it out flawlessly, as he always does with everything. Except... what is this guy's deal? A perilous romance between Han Saerim, who acts as if there's no tomorrow, and Kang Seungwoo, who plans out every moment of his life to perfection.