Jewelry appraiser Lin Wan met the mysterious rich man Gu Chenzhou at an antique auction. He came for appraisal with a blue diamond brooch engraved with his family's coat of arms. Lin Wan discovered that there was a yellowed love letter from the 1940s hidden in the middle of the brooch. The complicated emotions flashing through Gu Chenzhou's eyes when she stared at the letter made her say, "This brooch is waiting for its true owner." That night, Gu Chenzhou invited her to a private manor in the name of restoration, and their fates became entangled from then on.
- Lin Wan
- Core conflict: searching for the truth about life experience vs falling in love with the grandson of the enemy
- Emotional line: Gu Chenzhou (sadomasochism), orphanage friend Su Qing (best friend)
- Gu Chenzhou
- Core conflict: protecting family secrets vs. Protecting Lin Wan
- Emotional line: Lin Wan (forbidden love), father Gu Zhengxiong (antagonism)
- Key supporting roles
- Gu Zhengxiong: the mastermind behind the assassination plan
- Uncle Chen, the old butler: an insider who knows the secrets of three generations
