Reborn: My Girlfriend Vanished Midair

Frederick and Selene have been together long enough that he is taking her home to meet his parents. They fly out together and partway through the flight her seat is empty. The cabin crew tell him nobody was sitting there. The passengers, the police who meet the plane and his own family all tell him the same thing. Frederick keeps insisting and is committed to a psychiatric hospital, where another patient attacks him. He wakes on the morning of the flight again with everything he remembers still in his head. This time he watches people instead of arguing with them. The crew and the passengers and the relatives were all hired, and the whole day was put together for him alone. Frederick plays his part while he works out who paid for it. What he turns up goes back well before the flight, to an infant swapped for another one, a place in a wealthy family that went to the wrong son, and an organ trade running underneath the arrangement.