Second World. Moonbyul produced a powerful performance after pouring her heart and soul into it but only recieved criticism and a zero. She looks for the one person who could always cheer her up. 

Moonbyul is Solar's self-declared number 1 fan, Colleague 1. Solar also thinks that Colleague 1 is very important to her. However, things are challenging that status quo and they start to uncover new feelings for each other. Their journey starts from the time Solar and Moonbyul goes to the deserted island. Inspired by real-life events.