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Korean potter Jun-Ho (Song Seung-Heon) meets successful young entrepreneur Nanami (Nanako Matsushima) in Tokyo. The couple fall in love and soon marry. A year after their marriage tragedy strikes when Nanami is killer on her way home. Nanami, not ready to leave this world, remains in this world in spirit form. During this time she learns that her death wasn't an accident and her husband Jun-Ho is in imminent danger. Unable to contact any humans except a psychic named Unten (Kirin Kiki), can Nanami warn Jun-Ho before harm comes his way?

Wealthy plastic surgeon Gong Ki Tae is a successful and happy bachelor who does not want to find himself a wife. He believes that his life is perfectly planned, and being single is the only option he accept. However, his family is badgering him to marry. In an effort to get his parents off his back about the constant string of blind dates and marriage prospects, Ki Tae purposely brings Joo Jang Mi home to meet his parents posing as his girlfriend, certain that they'll never approve of her.

The top 1% of students from five prestigious universities in Korea (Seoul National University, KAIST, Pohang University of Science and Technology, Yonsei University, Korea University) participate, and only utilize brain power (mental calculations, calculations, reasoning, games, memorization, etc.) without politics, betrayal, alliances, or deception.