Oh Joo-eun

Celebrity guests are split into two teams to compete in various contests. One guest, known only to himself, is designated the "X-Man", and does his best to cause his team to lose the contests. At the end, all guests try to determine the X-Man's identity.

Male and female contestants compete for "each other" in romance games. For example guests have to dance in order to impress the person they are after. Contestants are artists, actors, models, comedians, and MCs of the South Korean entertainment industry.

As the chairman of GD Motors, Han Gi-Ju is a divorced man working in Paris. He takes Gang Tae-Young, who is working as a housekeeper at his home, as his date to a business party. She is a poor international student who is chasing her father's dream of studying in Paris. Han Gi-ju's nephew, Yu Soo-Hyeok meets Tae-Young by chance, and falls for her. Tae-Young ends up returning to Seoul, soon after, Gi-Ju and Soo-Hyeok also return to Seoul separately. Tae-Young asks Gi-Ju for a job and in time, the two fall in love. Gi-Ju's father tries to force his son to marry Moon Yun-A (Oh Joo-Eun) the daughter of an influential politician and she exhausts every means to make this happen. As the family secret involving Gi-Ju's and Soo-Hyeok is disclosed, the relationship between Tae-Young and Gi-Ju is in crisis.

Lieutenant senior Kang Seok-min(Kwon Sang-woo) joined the navy to follow in his dead father's footsteps, with the dream of becoming an admiral. At the hospital where Seok-min's sister, Soo-jin(Kim Jung-hwa), a young doctor who is still an intern, Seok-min runs into Hae-rin, a female doctor at the hospital. He tries to get close to Hye-rin(Myung Sae-bin) but she has shut others out since her boyfriend from college died. Hae-rin's senior from the medical school Seung-ha, who is also the son of the director of the hospital, has been in love with Hae-rin since the college days. However, he could only love her from afar since his friend confessed his love first. After the death of his friend, Seung-ha plays the role of a guardian for Hae-rin, but only to win her love. Seok-min's honest and yet impulsive behavior throws Hae-rin off. Nevertheless, ever since Seok-min gets involved in a critical situation on the naval base Hae-rin finds her heart drawn to Seok-min...

Nam Shin is a son from a family who runs a large company. After an unexpected accident, he falls into a coma. His mother Oh Ro-Ra is an authority on brain science and artificial intelligence. She creates an android named Nam Shin III which looks like just like her son Nam Shin. The android pretends to be Nam Shin and he has a bodyguard So-Bong.

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