Kim Joowon, a wealthy mogul, and Yoon Seul, the daughter of a former minister, go on a date. Later, a stunt girl comes to Seul's rescue.

Joowon takes Gil Raim to the hospital to get her treated for an injury. Joowon can't push her out of his mind, the first girl ever to stand up to him.

Joowon invites Raim over for dinner, planning to make a comeback into her favors by reconfirming his position as the department store's CEO.

Raim goes over to Joowon's to ask him if he was the one who listed her as the raffle winner, but he denies any involvement and firmly shuts her out.

Raim, Joowon, Han Taeseon (Seon), Choi Wooyoung (Oscar), and Seul revolve around the MV shoot and the hotel, as conflicts among them heighten to a breaking point.

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

Raim and Joowon, still trapped in each other's bodies, have a rather acerbic first encounter with Joowon's mother at his place.

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

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

Joowon tells his mother that his relationship with Raim is a mere fling and that there is no possibility of their ever getting married.

Joowon pours out his heart to Raim, 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 Wooyoung's song and readies herself to take full responsibility.

Joowon and Raim dance at the VVIP ball as the entire floor watches them in awe. Wooyoung finally realizes what he had done to tear Seul's heart apart.

Director Im Jongsoo and Wooyoung find out the truth about Joowon and Raim's body swap. Joowon and Raim temporarily move in together.

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

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

After the accident, Raim wakes up in Joowon's body. She cries over her own unresponsive body, where Joowon's mind may be trapped forever.

As the ice in Seul's heart slowly melts, Wooyoung is ready to make a full comeback. Meanwhile, the 21-year-old Joowon is falling for Raim again.

Joowon stands up to his mother, and he and Raim sign a marriage license. Meanwhile, Wooyoung's back in full sway, with Seul by his side.