Channel A's 'Detectives' Trade Secrets' revealed the case of a man who lent his girlfriend 300 million won before she disappeared, as well as the story of a wife who facilitated her husband's affairs with married women.

The episode covered two shocking cases through the true-crime reenactment segment 'Case Notes' and 'Detectives 24 Hours.'

◆ "Wife Who Facilitated Her Husband's Affairs"... Luxury Watch Swapped for a Fake

The first case involved an affair that began after the client, promoted to an executive at a large corporation, moved with his family to a new city in the provinces. The client's wife struggled to adapt to the new environment and suffered from depression, but her condition later improved and she began going out frequently.

However, the wife showed suspicious behavior, including demanding an additional 1 million won per month, supposedly for her hospitalized mother's care. Suspicion grew when the client discovered that his prized luxury watch, worth 20 million won, had been replaced with a fake.

The detectives' investigation revealed that the wife had been having secret meetings with her personal trainer. Shockingly, the mastermind behind the affair was the trainer's wife, the owner of a nail salon. After her husband's business failure left the family struggling financially, she lured married female customers from her nail salon into becoming her husband's personal training clients. Following his wife's instructions, the trainer seduced the married women with tailored flirting, while the wife sold the luxury gifts on secondhand trading platforms for cash.

Watching the broadcast, Defconn remarked, "This is a meeting between a pimp wife and a muscular gigolo," and Yoo In-na expressed shock, saying, "Conspiring in an affair for money — isn't that going too far?"

◆ "Selling Her Mother's Death for a Scam"... Girlfriend Takes 300 Million Won and Disappears

The second case involved a client with a side job as a pet taxi driver who lent his girlfriend 300 million won before she vanished. The girlfriend claimed she had lost her parents and was 200 million won in debt from her mother's medical bills, and even promised marriage. She also said she earned over 10 million won a month as vice director of a famous academy and that an 800 million won life insurance payout from her mother's death would soon arrive, extracting 300 million won through loans and support from the client and his family.

However, all of this turned out to be lies. The girlfriend deceived the client by claiming the residence she shared with her lover was academy staff housing, and collected an additional 130 million won under the pretense of monthly rent. She also falsely told the building manager that the client was a stalker. Her former employer, an academy, stated that she had not been vice director but merely a phone counselor, and that no academy staff housing existed. An academy official angrily said, "She also embezzled academy funds."

Her younger brother revealed that his sister had also taken 300 million won from the family home, and that he had even taken out student loans to cover living expenses. The brother said, "Because of my sister, the whole family went through debt restructuring," adding that there was no death insurance payout either.

Defconn said, "She committed fraud by selling her mother's death." The detectives tracked down the girlfriend, but she responded to all questions with "I'll talk at the police station," and when asked if she felt sorry for the client, she said, "I have nothing to say." Upon hearing the results, the client said, "My heart is breaking."

◆ Kim Hyun-wook Joins as One-Day Detective... "I Came to Understand My Wife's Loneliness"

Former KBS announcer Kim Hyun-wook appeared as a one-day detective on the broadcast. Kim, who franchised 'Kongbul' (bean sprout bulgogi), shared during the show that his wife, a Korean-Canadian living in Korea as a full-time homemaker, has almost no friends in the country and is struggling while raising twin children. After the case concluded, Kim sent a video message to his wife, saying, "Through today's case, I learned to recognize my wife's loneliness and took away a lesson that I must treat her better."

Meanwhile, Channel A's 'Detectives' Trade Secrets' airs every Monday at 10 p.m.