Jinwon, a chicken delivery man running through the night streets, unexpectedly bumps into his ex-girlfriend, Mi-young. As Mi-young questions him about his past, he shows her his deliciously fried chicken arm.

Joo-in, a 17-year-old student confused by love, unleashes chaos with some words spoken in a moment of anger. Anonymous notes questioning her actions begin to arrive, altering her quiet life.