At just 19 years old, Kim Joonmyeon also known as Suho, is South Korea's youngest prime minister's son. On top of his reputation of being an honors student, he's also an only child with his father. But what the public doesn't know is that despite his perfect image, Suho is becoming more and more depressed. Suffering from his mother is only one of the few things he needs to worry about. Once he turns twenty, he has three hundred and sixty five days to get married or, he'll get into an arranged marriage.

Park Jisoo, is a Senior at CMHS (Crescent Moon High School) as one of the bad students along with D.O, Kai, Sehun, Tao, Chen and Chanyeol. One day she runs into Suho and notices that he's the prime minister's son. As she chases him and his friends (Xiumin, Luhan, Baekhyun, Lay and Kris) around Seoul, she manages to get in a sticky situation bigger than their senior prank.

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"Let's make a deal."

"Okay, sure."

"How about you teach me to be a good girl that attends church, while I help you find the perfect girl to marry?"

"It's a done deal."