Jiyoo is a girl who is cheerful but despite her smile there are things she is going through that are very sad because everyone she loved from the beginning left her and her mother died of leukemia and a few months later, their father died in a car accident, so they were left with their sister, Heather, alone. but after a few years, her sister's boyfriend died out of so much sadness that she committed suicide, which is why jiyoo was left alone in such pain that she seemed to want to disappear but she chose to fight because she knew this was what his family wanted when she got home from school she went to work but before she went to work she invites jay, the boy she loves very much, to watch the sunset with her, she has wanted jay for a long time but the boy doesn't seem to feel the same, that's why he doesn't want to go with the girl watch the sunset because it also has a reason that the girl does not know