Until a few years ago, their marriage had been going smoothly. His wife was very passionate, and they deeply understood each other's feelings. Frequent business trips meant he rarely came home, but whenever he did, she would act so boldly that it stirred his heart. However, recently he noticed she no longer seemed as affectionate as before, leaving him restless. Worried that she might be having an affair, he could no longer bear the uncertainty and decided to hide cameras around the house to spy on her.