A modern woman, Su Wanwan, transmigrates into an ancient romance novel, becoming a tragic cannon-fodder female supporting character. The original owner had a child out of wedlock and endured endless criticism. Meanwhile, Prince Zhan Xiao Yeheng falls victim to a scheme and plunges off a cliff, his soul unexpectedly swapping bodies with Su Wanwan's three-year-old son. A majestic prince is trapped inside a toddler's body, while an innocent little treasure inhabits a fierce warrior's shell. Su Wanwan temporarily stays at the Duke's Manor with her "drastically changed" son, managing a pastry shop to make a living while investigating the truth behind the Xiangguo Temple incident years ago. The two join forces to tackle palace banquet crises, as well as the heavy conspiracies of the Gu family and Prince Qin, growing closer in their chaotic displaced daily lives and uncovering one old case after another.