乐莹（贾玲 饰）宅家多年，无所事事。大学毕业工作了一段时间后，乐莹选择脱离社会，封闭社交圈层，这是她认为与自己“和解”的最好方式。一日，在命运的几番“捉弄”下，她决定要换一种方式生活。在与外面的世界小心翼翼的接触中，乐莹结识了拳击教练昊坤（雷佳音 饰）。当她以为生活即将步入正轨时，接踵而至的考验却远超她的想象，滚烫的人生才刚刚开始……
本片改编自电影《百元之恋》。

Devastated after her mom's serious accident and grief-stricken because she hasn't become the daughter she wanted to be for her mother, Jia Xiaoling finds herself transported back in time to the year 1981, where she meets her young mother before she was her mom.