建筑公司理事英俊(李东健 饰)和在灯具店工作的小如(韩彩英 饰)相识两个月就闪电结婚,火热的激情在三年的婚姻生活中燃烧殆尽,貌合神离。 时尚顾问柔娜(严贞花 饰)和饭店管理人员敏才(朴拥宇 饰)相恋四年,结婚三年,正在经历着爱情的“七年之痒”,已无当初的浪漫温馨。 在陌生的香港,敏才邂逅了小如,二人一见钟情;几乎同时,英俊为了设计问题,拜访柔娜,心灵疲惫的柔娜,被英俊所吸引。看似永远不会有交集的四个人,分别和对方的爱人发生了一夜情。心灵错位的他们以外在电梯口相遇,所有的心情都写在暧昧的眼眸里,尴尬?惊喜?心跳?他们该何去何从?A young couple, Young-joon and So-yeo, have a stable marriage. On the day that their mutual friend opens a wine bar, they come across Min-jae and Yu-na, a couple quite the opposite of themselves. After their conversations at the bar, Young-joon becomes a client of fashion consultant Yu-na, while hotelier Min-jae agrees to help So-yeo with her travel arrangements for her Hong Kong business trip. So-yeo meets Min-jae by chance in Hong Kong, while Young-joon trades suggestive remarks with Yu-na who visits him on a consulting session. That night, the four of them find in the other partner what had been missing in their respective marriages.