Married man Bong-wan (Kwon Hae-hyo) fell in love with a woman who worked at a publishing house, but they recently separated and he felt very sad. On this day, Bong-wan left home in the early hours of the night as usual and went to work at the publishing house. But his wife found his love letter and chased him to the publishing house. It happened that Ya-lin (Kim Min-hee) came to work at the publishing house, and Bong-wan's wife mistakenly thought that Ya-lin was the woman who was dating her husband.