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El exitoso empresario Joo Won tiene que llevar a la actriz Chae Rin a Oska, el famoso cantante, también su primo, para evitar un escándalo. Pero en lugar de Chae Rin, él en realidad lleva a su doble Gil Ra Im al hotel.

Al estar aliviado el escándalo con su ex Chae Rin se resuelve, otro ex de Oska resulta ser un candidato como su nuevo director. Y Joo Won no puede dejar de pensar en la doble, ¿le gusta Gil Ra Im?

Joo Won comienza a seguir a Ra Im y él la invita a almorzar. Después de ser rechazado, está decidido a quedarse con ella e incluso llega a la escuela de acción donde trabaja. Pero luego descubre lo diferentes que son sus mundos.

Joo Won insulta a Ra Im por su falta de riqueza, pero no puede sacarla de su mente. Oska trata de reclutar al cantante y compositor Tae Sun para que sea su protegido.

Ra Im, Joo Won, Ssun, Oska and Seul revolve around the MV shoot and the hotel, as conflicts among them heighten to a breaking point.

Joo Won and Ra Im wake up in each other's bodies. Greatly confused, they try to find a way to swap themselves back, but nothing seems to work.

Ra Im and Joo Won, still trapped in each other's bodies, have a rather acerbic first encounter with Joo Won's mother at his place.

The tension between Oska and Seul rises and falls as they reminisce on the good old days when their love was sweet and the future bright.

The moment Joo Won becomes drenched in rain, Ra Im's and his souls are miraculously swapped back into their own bodies. Ra Im gleefully takes off.

Oska struggles in the aftermath of the plagiarism scandal, while Joo Won proceeds with his new project to build a healing resort.

Joo Won tells his mother that his relationship with Ra Im is a mere fling and that there is no possibility of their ever getting married.

Joo Won pours out his heart to Ra Im, revoking his request that she be his mermaid, someone who'd quietly stay beside him and dissolve into foam.

Seul finds out that one of her employees accidentally leaked Oska's song and readies herself to take full responsibility.

Joo Won and Ra Im dance at the VVIP ball as the entire floor watches them in awe. Oska finally realizes what he had done to tear Seul's heart apart.

Director Lim and Oska find out the truth about Joo Won and Ra Im's body swap. Joo Won and Ra Im temporarily move in together.

After Ra Im misses the audition to ensure Joo Won's safety, blowing the chance of a lifetime, he pulls all available strings to get her another shot.

Joo Won's mother promises Ra Im riches to let Joo Won go. But when she realizes that she won't be able to buy her off, she threatens to fire Joo Won.

After the accident, Ra Im wakes up in Joo Won's body. She cries over her own unresponsive body, where Joo Won's mind may be trapped forever.

As the ice in Yoon Seul's heart slowly melts, Oska is ready to make a full comeback. Meanwhile, the 21-year-old Joo Won is falling for Ra Im again.

Joo Won stands up to his mother, and he and Ra Im sign a marriage license. Meanwhile, Oska's back in full sway, with Yoon Seul by his side.