With a contract, she became his hidden wife. He gave her fine clothes and food, and also gave her strict discipline. She hid her edge and studied silently, until one day, she pushed the revised terms back to him: "Mr. Lu, this time, I will decide the rules of the game." From chess pieces to chess players, from birds in cages to eagles side by side. This marriage, which started out as a transaction, ended up being a matter of two sincerities.