Every love is beautiful at the beginning, but as time goes by, the beautiful love will slowly deteriorate, how many people can survive Six-year itch? Duozhen (Jin Ha Neul) is a happy woman in front of outsiders. She has a decent job-the planner of a publishing house, responsible for books on love, and the books planned by her are very popular. The most important thing is that she also has her boyfriend Jae-young (played by Yoon Kye-sang) who was together when she was a student. Jae-young is the producer of home TV shopping and the idol of thousands of girls. These two men are talented and beautiful, and they are very well matched. But their love has changed from being gluey in the past to being tense now. Duozhen is a romantic woman, but after graduation, Jae-young is always busy with work, and the so-called romantic thing he does with her is to watch the night view on the balcony. The relationship between the two is not as harmonious as before. In order to cherish this love and change the current status quo, the two decided to take the current relationship a step further and enter a cohabitation state. The relationship between the two became more rigid, and at one time it reached the point of breaking up. Internal and external troubles, in addition to facing their own problems, they also have to deal with the "third party" lurking outside