Liu Mianmian is forced to marry into Prince Jin's residence in place of her elder legitimate sister, who has eloped on her wedding day. Always regarding herself as a substitute, she keeps her head down and lives quietly. Three years pass in the blink of an eye, and her elder sister is about to return. Unexpectedly, Liu Mianmian discovers that she is pregnant. Under mounting pressure, she stages her own death in a fire and secretly flees south with her maid. But just as she escapes aboard a boat, Prince Jin, Xiao Jin, suddenly finds her. Facing his icy interrogation, Liu Mianmian is filled with anxiety, believing she cannot escape her predicament. As layers of misunderstandings are gradually unraveled, she is astonished to discover that everything she believed about the past was completely different from the truth.