As Joon Hee struggles to distinguish reality from her dreams, she receives an old diary that contains a shocking truth.

Back in 1998, Joon Hee's bubbly personality shines through Min Joo. Those around her begin to notice — including a mysterious figure who watches from afar.

Si Hun finds himself attracted to the new Min Joo. The love triangle grows when he decides to come clean to Jung In gyu.