一位即将退休老爸─黄金发（蔡振南饰）自认为凡事交给他都“大丈夫”（日语：だいじょうぶ，意思即“没问题” ），但是对上他的三个女儿与未来女婿，就不一定能“大丈夫”... 因为大女儿黄天岚（周晓涵饰）的男友许明陆（周孝安饰），正是黄金发的新上司，二女儿黄天虹（林昀希饰）的丈夫背叛天虹出轨，小女儿黄天祯（陈天仁饰）竟敢挑战禁忌谈上一场校园恋爱。

17-year-old Hsiao-nan turned to her best friend, the guitarist Yu-kuang, to help her win the affection of Tzu-Chieh, whom she had a crush on. Together, they participated in a musical audition, and everything seemed to be going smoothly. However, during the audition, Hsiao-nan realized that the person she truly loved was Yu-kuang himself. Despite having beautiful memories together, they missed the chance to be with each other. Now, as time has passed and they are grown-ups, Hsiao-nan is faced with the love of her youth. Will she bury her feelings in memories, or will she muster the courage to listen to her inner voice?