Running from a past failure, a food delivery driver, rides the streets of Seoul. But as he rebuilds his life, his determination attracts the attention of LE SSERAFIM, forcing them to confront the very image of perfection. As their lives intervene, they discover an unexpected bond. Set in Seoul, this story weaves together a mix of slice-of-life, food, drama moments, and of course, romance...Could his protective cynicism, prevent him to keep a 'promise'?