Song Jichan, a ghost who has lost all his memories, asks for help to Jung Seri, the only person who can see him. Reluctant at first, Seri, with her ghosts friends trio, agrees to help him find his lost memories.
As Jichan and Seri slowly open their hearts to each other, their investigation encounters an unexpected crisis when they start to discover who might be hiding behind Jichan’s death.