Meet Yonghwa- a nerdy college professor, he wakes up every morning on the dot, shower everyday for 15 minutes eat breakfast for 15 minutes and go to work exactly 7 am every day. He wants everything to be tidy, in order and clean. And has a mild case of obsessive-compulsive personality disorder, in which he is aware of and has sought help with a professional. His friends and family says it is impossible for him to be married but he thinks otherwise. He has found the love of his life.

Meet Joo Hyun- a gorgeous young woman hidden in old fashion clothes and thick rimmed eyeglasses, a quiet and shy lady working as the school librarian. She graduated with the highest of honors but is aloof, and wants to keep to herself. Social life is 0 until she met someone.

Meet Seohyun-  equally gorgeous but with characteristics that are poles apart from Joo Hyun, she is driven, aggressive and protective of Joo Hyun. She works as a member of a band, assigned as the vocalist while playing the keyboard and sometimes the guitar. She is also a black belter in taekwondo. 

Meet Ji Min- Yonghwa’s sister, and is also a member of the band with Seohyun. She is assigned as a rapper and lead guitarist of the band, together with a bassist and the drummer.  

And now for their story....