On a snowy night, Li Xin, the descendant of the Mortenson and Tenon family, picked up the baby girl Xia Jin.
For eighteen years, she was his light and he was her root.
Until a Japanese consortium hired her at a high price to "exchange skills", a secret letter revealed the truth: Xia Jin was actually a "mortise and tenon spy" carefully cultivated by the other party.
She trembled and smashed the ancient architectural model they had made together, but Li Xin held her bleeding hand: "Good! But can you steal the soul of the tenon and tenon joints?"
