'Detectives' Trade Secrets' reveals the heartbreaking story of a 20-year-old man searching for his biological father who left 18 years ago, and an aunt who raised that nephew like her own child.

On Mon. the 23rd at 10 p.m., Channel A's Detectives' Trade Secrets will air after receiving a desperate request from a 20-year-old client asking, "Please find the biological father who left 18 years ago." The client was raised within the protective care of the aunt's family, the sister of his biological mother, from around the age of two following his parents' divorce. Originally, the client had been placed with his biological father's family, but the aunt, feeling sympathy for the nephew, brought him home after discussing it with her husband and raised him alongside her two sons as if they were biological siblings. The client expressed deep gratitude and affection toward the aunt and uncle who cared for him like their own child, saying, "My aunt and uncle are like parents." The aunt also revealed her extraordinary maternal love, saying, "I have never thought of him as just a nephew. I tried to raise him exactly like my biological sons."

But when the story about the client's biological mother continues, the studio is thrown into shock. The client's aunt said bitterly, "In the past 18 years, my sibling has only come once, to our nephew's elementary school graduation. The only financial support was 300,000 won." She added, "We never received any child support, and on the contrary, I lent money," a revelation that horrified everyone.

In particular, four years ago, unable to refuse her sibling's earnest plea, she lent money she had saved for surgery fees, but the sibling neither repaid it nor hesitated to react outrageously by reporting the sister to the police when asked to return the money. The cast members watching this could not hide their anger and sorrow, saying, "I can't see her as a mother or a sister," and, "It's unreasonable."

To make matters worse, sad news about the aunt's health further dampened the mood. The client's aunt is currently in end-stage renal failure and urgently needs a kidney transplant. The client confessed the story that he had even decided to donate one of his kidneys, saying, "I thought it would be better to give one of my kidneys than to watch my aunt suffer like this," bringing tears to everyone's eyes.

Upon hearing this, Kim Poong sighed, "I can't believe such misfortune could happen to someone so angelic... it makes you wonder if there is a god." The married detective team handling the case begins a full investigation based on clues about the client's biological father. Viewers' attention is focused on the tearful story of the aunt and nephew, who are closer than mother and child, and whether the father and son reunion that might be possible after 18 years will happen can be confirmed on Channel A's Detectives' Trade Secrets on Mon., Feb. 23 at 10 p.m. (Photo courtesy of Channel A's Detectives' Trade Secrets) [Photo]

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