He's the only one left. She's the only one who can help him.  Both are from vastly different worlds and lives, but have one thing in common:  they have nothing left to lose

Jia is a ghost. Metaphorically, of course. She's never stood out, nor did she want to. Content is the word she'd use to describe her quiet lifestyle for the past 18 years. That is until she accidentally gets mixed up in Kyungsoo's life and finds that he isn't quite the person she remembers him to be. The boy she once thought to be charismatic has become a recluse from their high school