Before going on a business trip, Lu Heng pinkie-swore with his daughter to attend her graduation ceremony together. When he returned from his trip, however, his daughter had already passed away unexpectedly. Upon investigating, he discovered that his wife, Yue Xin, was entirely preoccupied with her first love, Tang Xu, neglected their daughter, and even secretly misappropriated their daughter's education fund to support Tang Xu's startup. Suppressing his grief, Lu Heng stepped-by-step laid out a plan, produced complete evidence, and made everyone who owed a debt to his daughter pay the corresponding price. After the storm passed, he also walked out of the pain and embraced a new life.