Doyoung had a small memory loss, but he doesn't mind as long as his friend is there for him. But a visitor from the past wants to remind Doyoung some things. What will the person reveal? How will Doyoung react?

From the first time Pentagon became a group, everyone understood that there was something between them. They slowly show to each other more affection. But is this right for the group? From the other side is Yuto who approaches shy Yanan, but Yuto's 'rival', Shinwon gets in the middle. What will happen between these three?