Su Ran once disguised herself as a nanny to get close to Song Lüchuan, the young heir of Beijing's elite circle. She accidentally discovered that he regarded her as nothing more than a pastime, so she quietly left. Five years later, she reunites with Song Lüchuan at an auction while accompanied by her son, Naonao. Naonao wants to bid on a pink diamond as a birthday present for Su Ran, but the crowd mocks him. At the critical moment, his father arrives and reveals Su Ran's true identity. Only then does Song Lüchuan learn that Naonao is his biological son. Filled with regret, he tries to make amends, but Su Ran has lost all hope in him and refuses to have anything more to do with him.