Kang Yu-Yu was used and abandoned by Seo Ho-Su, who was his secret lover for 5 years. After getting drunk, he woke up and found himself back 5 years before he started dating Seo Ho-Su. He doesn't know what happened, but Yu-Yu takes this opportunity to vow his revenge on Seo Ho-Su. But unexpectedly, Seo Ho-Su catches Kang Yu-Yu first? Yu-Yu is shaken by the heart-flutteringly innocent Seo Ho-Su. Will he be able to take his revenge? (Source: BOMTOON, translated & edited)