Lee Sang-won

Two strangers have dropped their kids off at a pickup area for a children's camp in Helsinki, Finland. A spark of mutual interest is ignited between the man and woman.

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.

The story follows an extended family's love dilemmas, family arguments and family secrets.

In the Joseon Dynasty period, the kingdom was enveloped in a political maelstrom. Cheo Seon was born as a posthumous child and separated from his mother immediately. When he meets So Hwa, the daughter of a powerful noble, he falls in love with her immediately. He voluntarily becomes a eunuch to be close to So Hwa. Entering the royal palace, he sees King Sung Jong and So Hwa spend their first night together. He becomes So Hwa's loyal protector. As the political battles rage on among the courtesans and wives in the palace, So Hwa is chosen by the king to be his queen and Cheo Seon vows to be her loyal servant. But So Hwa is eventually dethroned as the queen and leaves the palace in disgrace. Cheo Seon helplessly watches these events unfold and he secretly helps So Hwa. But in a cruel twist of fate, he is the one chosen to execute So Hwa's death sentence by serving her a bowlful of poison. After So Hwa dies, he looks after her son King Yeon San as if he were his own son.

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.