Chan-hyeok and Min-ah, who promised to get married, love each other. One day, Min-ah has a nightmare and she grabs Chan-hyuk's head in her sleep. Chan-hyeok pats Min-ah because she is just a dog dream, but Min-ah feels uncomfortable because her dream is not clear. Chanhyuk's event made Minah feel relieved. But when Min-ah goes to work, she comes to Chan-hyeok, a strange woman ... Chan-hyeok is surprised to see her playing. The two of them worked in the same place in the past...