_Bunmo_
To save the man who raised him - the only family he has ever known - Kai Aoyama picks up the pen. He signs away his freedom to save his foster brother, believing it is a sacrifice he could survive.
He was wrong. The contract isn't a debt to be paid; it is a cage with no exit. Kai thought he was entering a marriage of convenience to save a life. Instead, he has stepped into the carefully constructed world of Ren Ishikawa - the man who has been watching him, shaping his choices, and pruning his life for fifteen years. But the most terrifying truth is still coming: the man Kai married has always been someone far closer than he ever imagined.
Now bound to his brother's tyrant friend, Kai is slowly uncovering the truth: This was never about a business transaction. There is no expiration date. Ren doesn't want a partner. He wants ownership. And Kai was never given a choice.