Delivery rider Kwon Do-eun prioritizes his family's happiness over his own. Delivery work, home, delivery work, home... His days repeat the same routine—until his first love, Lee Se-bin, suddenly reappears.

But with him comes the nightmare of that day.

"Lee Se-bin... It's been a while."

Fueled by explosive anger, Do-eun swings his fist before he can stop himself— and it lands squarely on the face he once loved.

"...I'm screwed."

Having tangled his own fate, Do-eun finds his peaceful life crumbling day by day, caught in Se-bin's threats and endless schemes.