Genius toxicologist Ji Nian accidentally transmigrates into the novel Daddy Boss's Beloved Little Princess, becoming the seven-year-old biological daughter who shares her name. But the system quickly warns her: the real heroine of the story is Shen Qingtang, the adopted daughter of the cold and powerful Ji Tingzhou. To survive, Ji Nian puts on her best act as a sweet, naive child—quietly planning to stay low until adulthood, grab some cash, and disappear to make way for the true female lead. What she didn’t expect was to slowly win over her ruthless father and the loyal team around him... and somehow become the new favorite in the family.