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Do Jae proposes Se Gye to sign an agreement with him to get know each other and strengthen their “business partnership”. Se Gye can’t help herself but wants to know about this mysterious man just a little bit more. After all, he is the only man in this world who recognizes her when she changes into a different person.

Do Jae and Se Gye admit that they’re in a relationship in front of the press and start to pretend they are a real couple. To convince the public, they go on dates in the public places. Jeong Yeon, who doesn’t know the fact that they date for show, disapproves of their relationship and even sends money to Se Gye to make her break up with his son.

Jeong Yeon is so shocked after finding out that Do Jae spent the night with a young boy without knowing that the boy is Se Gye. The young boy Se Gye gets into a fight with other high school students. In the meantime, Sa Ra attends a luncheon where the country’s leading CEOs are gathered.

Se Gye is left absolutely perplexed upon seeing Do Jae’s reaction after their kiss. To make matters worse, Yu Ri feigning innocence really gets on her nerves. Meanwhile, Do Jae hears rumors about Sa Ra and decides to step in as what any older brother would do.

Se Gye and Do Jae start going out as a real couple, but in secret. The public think that they’ve broken up, so they need to figure out a way to best play the “we’re good friends” game. But Se Gye’s bliss is threatened as the dreaded date conflicts with her shooting, which could jeopardize her career.

Se Gye’s mother visits Se Gye’s home without notice when Se Gye has changed into a young boy. During her mother’s stay, Se Gye realizes how much her mother worries and cares about her. In the meantime, Do Jae’s grandfather invites Se Gye to his family gathering without telling Do Jae.

Eun Ho brings Sa Ra a cake on her birthday, but things get awkward after Sa Ra confesses that she likes him. Meanwhile, Se Gye’s mom is determined to get her daughter married to Do Jae, that she even brings home-made lunchbox to his office. But her sudden appearance is of no coincidence, and Se Gye is about to find out something about her mother that will rattle her world completely.

Even in mourning, Se Gye does her best to give a good performance for her movie shoot. Yu Ri feels suspicious about Se Gye, so she hires a person to dig information on her. Meanwhile, Do Jae organizes a special surprise trip for Se Gye for their romantic get-away.

Sa Ra finds out about Do Jae’s condition and is able to clarify all the misunderstandings she had about him. Yu Ri obsessively looks into Se Gye to find out what she’s really hiding, and eventually comes up with a plan to reveal her shocking secret to the entire world. Meanwhile, Se Gye’s transformation date nears but this time something goes wrong.

Do Jae is faced with a difficult question - if he is willing to be by the old and wrinkly man’s side, that Se Gye has turned into, for the rest of his life. Do Jae finds himself pondering over this dilemma. Meanwhile, Yu Ri is determined to reveal Se Gye’s secret once and for all, and meets up with Reporter Park.

Se Gye is in deep shock and hates herself for having been the root cause of Do Jae’s illness. Do Jae feels helpless that he can’t fix the way things have turned out and desperately tries to hold onto Se Gye. Regardless, Se Gye decides to leave Do Jae for good, and even officially announces her retirement.

Se Gye is back in the spotlight with her return to screen. Rumors of her dating her co-star hit the headlines, and Do Jae falls a bit sullen that Se Gye hasn’t texted him back for a whole day due to her busy schedule. Meanwhile, Joo Hwan sees a photo of Do Jae being intimate with a woman he’s never seen before and worriedly goes to Woo Mi.