A crime thriller about a man who spent a night with a strange woman who doesn't even know his name before getting married.

An Na is a planner at a start-up company who has trouble with the only developer of the company. She wants to get along with the developer, but he seems to be anti-social. One day, she gets a mission from her CEO to meet "Turtle Egg" who's been messing with the ecosystem of the app they've been working on. And from "Turtle Egg", An Na learns the biggest lesson of her career.

A novelist suffering from a prolonged writer's block loses confidence in his work and love life.