Ethically, the director believes that there are two main factors that lead to the success of wife exchange. First of all, as the hero's colleague and club promoter mentioned to his wife, their marriage has problems, including life and, of course, sex.
Heng and Joan are in their thirties. They have been married for many years and their son has gone to kindergarten. However, every time she had constant sex, Joan refused because she was too tired. Finally, one morning, on their way to work, they discussed the issue of sex and decided to go on holiday at the weekend, looking for new excitement and embellishment of plain sexual pleasure.
However, the holiday wanted Heng to discover the fact that he had no sexual desire when facing Joan, so the relationship between them was worse than before the holiday. Heng confided to his good friend and boss, and suggested that he and his wife take part in the "Change 7" activity and abide by the rules of the game.
The other is that someone must guide them to understand the life of the club, which must instill in them how this "transaction" reasonably weakens their moral control. Once they really enter this club, whether they adapt to this life depends on themselves and on Kant's most powerful moral law in their hearts. There are both internal and external causes in the philosophical sense, accidental factors and inevitable factors coexist, and the development of things mainly depends on internal factors-these are vividly reflected in the film.