Kyungsoo and Chanyeol are happily married with children. One day, Kyungsoo wakes up and finds himself 14 years in the past where he is still single and the children have not been born. Now, Kyungsoo has to make Chanyeol fall in love with him all over again. The catch is, they were enemies in the past and Chanyeol still despises Kyungsoo for a past tragedy.