Channel A's 'Detectives' Trade Secrets' will feature a story about the suspected affair of a popular chef husband and the possibility that his mistress is his sister-in-law.

At the center of this episode is the story of a female client who suspected her husband of cheating and asked a detective team for help. The client was introduced to her husband, a chef at an Italian restaurant, through his older sister, who was also a close friend. They married six months after meeting. In the early days of the marriage, the mother-in-law also regarded the client as an ideal daughter-in-law.

The restaurant run by the husband was bustling with female customers. Kim Poong commented, "The popularity of unmarried chefs like Yoon Nam-no or Napoli Mafia is no joke."

However, the client recently felt anxious, saying her husband frequently left the restaurant and lied. The detective team confirmed that the husband visited a certain house every other day and secretly met a woman there. The two were also caught engaging in intimate behavior, such as linking arms and touching each other's cheeks.

After checking the identity of the woman in the photos, the client revealed that the woman was her husband's older sister — in other words, her sister-in-law. Regarding the situation, Defconn reacted strongly, saying, "What kind of nonsensical act is this?" and Kim Poong said, "It's crazy." Actress Lee Soo-kyung added, "It gives me chills. Isn't she a devil?"

Meanwhile, Lee Soo-kyung, who appeared as a one-day detective on the show, revealed her hobby of collecting wine and whiskey. She said, "A wine I bought for several million won has gone up tenfold in value and is now worth over 100 million won," adding that she plans to drink it at her 60th birthday celebration in 20 years. Lee Soo-kyung's confession about her ideal type will also be introduced in the broadcast.