Channel A's 'Detectives' Trade Secret' covers the story of a female doctor in her 40s who discovers the outrageous double life of her boyfriend, who is 12 years her junior.

According to the broadcast, the client met her boyfriend during a trip to Japan three years ago and maintained a relationship for a year, traveling back and forth between Korea and Japan. When her boyfriend was uncertain about his career path, she actively encouraged him to prepare to become a flight attendant and fully supported him until he passed, helping him secure the job.

She began dating him in earnest after he started working as a flight attendant, but the incident erupted when mysterious bruises and IV marks were recently discovered on his body. The client suspected workplace bullying, but her boyfriend explained them away as 'injuries caused by a heavy workload.' However, the detectives' investigation revealed the shocking fact that he had been cheating on her behind her back.

Seeing this, Defconn erupted in anger, saying, 'Even animals wouldn't do this. It goes beyond audacity—he's a crazy person.' Attorney Nam Seong-tae could not hide his astonishment, remarking, 'With that level of behavior, he deserves to be hooked up to an IV.'

On this day's episode, singer Wax appears as a guest detective and opens up about her past dating experience. Wax revealed, 'My boyfriend said he was having lunch with his boss, but I actually witnessed him getting into a car driven by another woman.' She added that he didn't even answer her phone calls. Fellow cast member Yoo In-na deeply sympathized, saying, 'It must have felt like the sky was falling,' and the other panelists also expressed their shock.

Wax's ingenious way of handling the situation and the full details of the cheating scene will be revealed on Channel A's 'Detectives' Trade Secret,' airing on July 13 at 10 p.m.