Lin Wanxi accidentally agrees to a contract marriage, marrying into the Gu family to take care of the little boy Xingzai. While coping with complicated family interpersonal relationships, she slowly explores the mysteries of the past. Getting along with her agreement husband Gu Huaizhou, they understand each other, part the layers of mist, unravel the sealed past entanglements, and finally harvest their own warmth and happiness as a family.