Min-gyeol has an unrequited love for Tae-eun, the younger brother of the owner of a regular cafe. She is suddenly asked to deliver a letter from Tae-eun. It turned out that the letter was a suicide note. Min-gyeol, who suffered the death of her friend last year, decides to wait with Tae-eun in hopes that she will be of help to Tae-eun..