Kim Yeon U, age 30, is a lonely civil servant and has recently moved into an apartment where witty Han Su Yeong, age 18, also lives. They bump into each other and are intrigued by one another, despite the 12 year age gap. Gang Suk, age 22, has recently started work at the same office as Kim Yeon U. He sees the beautiful Gwon Ha Gyeong, age 29, on the subway one day and tries to woo her. However, she is still feeling hurt from a lost love and has no thoughts for any other man.
A story about the two mismatched pairs in their search for happiness.