Kang Daniel and Nam Joohyun have been best friends ever since they left the womb. Being neighbours in Busan since they were born, it was impossible for them to not see each other.
21 years later, their friendship still strong as ever, Joohyun has been busy promoting with her group, Millenium, for the past four years, and now Daniel has finally made his debut as the centre of freshly out of Produce 101 group, Wanna One. He finally gets to meet Joohyun as a hoobae on the stage.
But how will people welcome their friendship? What will become of their relationship? And who might stand in the way?
"I'm sure one day you'll start dreaming again!"
"How can you be so sure?"
"Because I trust you"
What happens when a young novice is forced to spend some months together with a young boy with behavior problems? Will she be able to help him? Or will that cohabitation become a nightmare for the two of them?