The story follows the unconventional romance between two deeply scarred individuals:

( Kim Soo-hyun ): A selfless psychiatric ward caretaker who has spent his life running from town to town to care for his autistic older brother, Moon Sang-tae ( Oh Jung-se ).

The trio eventually settles in their fictional hometown of Seongjin City, where they work at the and begin to confront their shared, traumatic pasts. Key Themes Kim Soo-hyun

( Seo Yea-ji ): A popular but antisocial children's book author who is incapable of feeling love.