Gu Changting, at one hundred years old, drinks the rejuvenation dew, and his body returns to the age of eighteen. He adopts the alias Gu Yannian, and with the assistance of housekeeper Su Quan, conceals his identity. He enters high school to study, and encounters Shen Wanxing, a young girl resembling his first love Shen Xinglan. At this time, great-grandson Gu Chengye colludes with outsiders to short-sell the Gu family business, forging a will to plot for the family property. Grandson Gu Zhiheng has long since recognized his reborn grandfather, and the two secretly lay out their plans. At a charity banquet, Gu Changting exposes the conspiracy, and Gu Chengye is defeated and arrested. Gu Changting reads the long-awaited letter from his first love, resolving his years-long emotional knot. With the storm subsided, he gives up taking charge of the group again, and in the identity of Gu Yannian, experiences a brand-new life.