Yoon-jung accidentally calls a stranger, instead of her boyfriend, and has phone sex with the unknown man. When Yoon-jung's relationship with her boyfriend turns sour, Yoon-jung meets Hyun-seung, the stranger she had phone sex with.

Ji Yeon is a beautiful university student, majoring in music. She is dating Dong Seok, but Dong Seok’s parents want him to study abroad. The day before he is scheduled to leave South Korea to study abroad, he prepares a proposal event for Ji Yeon. Ji Yeon does not appear at the event.

The story of two men and two women, of entirely different tastes, start living together by chance. Their sweet little cohabitation begins!