"dear diary, something good happen today..."

The story revolves around second year Psychology major Kang Seulgi, who wrotes everything on her diary. Her diary is like her treasure chest. Treasure chest of secrets like her secret feelings for second year Visual Arts major, Kim Taehyung, who by now is one of the most loved guys of the campus, and it so happened to be Seulgi's best friend. The tables will turn once Seulgi's diary is lost and found unexpectedly on someone's good hands.

"dear diary, i heard he's planning to court someone. how can my feelings be so hard to show, but i really want him to know..."

"What can I do?"

"....... I think I love him."