Channel A's 'Detectives' Trade Secrets' will feature the story of a woman whose life was transformed 40 years ago by the help of a doll factory owner couple.

The upcoming episode depicts the story of a woman in her 50s who hopes to reunite with the benefactors she met while working a part-time job as a ninth-grade middle school student.

Three Meals a Day and Night School… The Doll Factory Owner Couple's Special Love

The client lost her father at age 10, and her mother raised three children alone, struggling to make ends meet. After a fire broke out at their home and they lost their place to live, she had to steal corn used for cattle feed to satisfy her hunger.

To support her family's livelihood, the client began working at a doll factory, where the owner couple she met provided active support. The couple provided three meals a day and paid her more than the promised monthly salary.

When the client was about to give up on going to high school, the wife recommended that she attend night school and personally visited her mother to persuade her. The couple also helped with the enrollment process. They later got her a job at a factory run by the wife's older brother and fully covered her tuition so she could continue her studies. Thanks to them, the client graduated from high school without a single absence.

The Cast Is Moved… Praised as 'True Adults'

The cast members were moved by the story. Defconn said, 'It's not easy to do that for others—it's remarkable,' and Yoo In-na called them 'true adults.' Kim Poong also said, 'Meeting an adult like that even once in your life is a great blessing.'

The broadcast will also reveal why the client had no choice but to leave her benefactors.

Lee Jae-yul Joins as a One-Day Detective… First Unveiling of New Cha Seung-won Impression

Comedian Lee Jae-yul, whose videos have accumulated 2.2 billion views, will appear as a one-day detective on the show. Lee Jae-yul will share behind-the-scenes stories of his 'season-based impression' of Cha Seung-won and unveil a new Cha Seung-won impression for the first time.

When he performed Hyungdon and Daejun's 'Songs That Feel Worse When You Listen to Them on a Bad Day' in his Cha Seung-won version, Defconn drew laughter, saying, 'This is possession.'

'Detectives' Trade Secrets' airs on Monday, October 26 at 10 p.m.