My Little Old Boy (a.k.a. Mom's Diary: My Ugly Duckling) is a South Korean television entertainment program, distributed and syndicated by SBS every Sunday at 21:05 (KST).
Regular members Name Mother Episodes Notes Lee Sang-min Im Yeo-soon(Ep 32–63, 69–70) 32–present Lee Sang-min is the leader of the cast members of the show. He has a debt of about $6 million and he is frugal as a result of it. He lives on his memories during his glory days and often likes to show off. He is a sneaker collector and takes great interest in shoes. It was said in the show that he keeps around 300 pairs of sneakers in his home. He is also friends with most of the sons on the show. Kim Jong-kook Cho Hye-seon (Ep 78–287,331) 76–460 He won the Grand Award at the 2020 SBS Entertainment Awards.
He loves to exercise and often goes to the gym.
His testosterone level is 9.24.
Similar to both Kim Hee-chul and Hong Jin-young, Kim Jong-kook also enjoys playing video games.
Like Lee Sang-min, he is frugal and does not tolerate people wasting anything.
He announced on August 18, on the Running Man set, that he will marry his non-celebrity girlfriend.
On September 5, 2025, he married his non-celebrity girlfriend in a private ceremony at J Hotel in Gangnam, Seoul. Im Won-hee 87–present Known as "pitiful Won-hee" because of the way he dresses and his red cheeks. He is fond of going to the flea market to buy exotic old toys at high prices, as well as clothing. He is generally calm and he enjoys things that bring old memories. He won the Best Couple Award at the 2020 SBS Entertainment Awards. 109–231, 406–presentBae Jung-nam lives alone with his dog named Bell. He takes interest in fashion designing and he hand sews old clothes and creates new designs out of them. He speaks in Busan dialect. He is a fashion model as well as an actor. Kim Hee-chul (Super Junior) Kim Sun-ja 153–present Similar to Hong Jin-young, Kim Hee-chul likes to play video games. He loves watching Chinese martial arts drama series and memorize the dialog of the entire scene. He is extremely neat to the point of avoiding cooking food at his own home. Dindin Kim Pan-rye291-present Heo Kyung-hwan Lee Shin-hee302-presentLee Dong-gun Seo Young-nam365-present Choi Jin-hyuk Park Mi-jia (Ep 392–present) 234–265, 293–present Han Hye-jinYoon Ji-young367-presentKim Seung-sooChoi In-sook (Ep 369–present)367-present Lee Hong-gi Gong Seung-ok 442-presentJung Gun-joo Moon Nam-mi 477-present
Former Name Mother Episodes NotesKim Je-dongPark Dong-yeonPilot–3Kim Hyun-jooPilot–31He suffers of mysophobia so he spends most of his time cleaning the house and car. He's a figurine lover, especially the Star Wars ones, Darth Vader being his favorite character.Kim Gun-moLee Sun-miPilot–167He is a soju lover, bicycle maniac (he owns 7 bicycles) and has a love for printed T-shirts. He has a game addiction. He also has a large collection of drones. Park Soo-hong Ji In-sook 1–237 He has andropause and is a club frequenter. Hong Jin-young& Hong Sun-young Choi Mal-soon 118–217 Hong Jin-young lives with her older sister Sun-young. Jin-young likes to play video games. Lee Tae-sung& Park Young-hye 184–301 Lee Tae-sung lives with his younger brother, singer Sung Yu-bin, and is raising his son Han-seung as a divorced single father. Han-seung splits his time between his father and paternal grandparents' homes. 226–293Park Goon was a former special forces soldier and is currently a trot singer. He has a good personality. He often hangs out with Lee Sang-min.Tony AnLee Ok-jin (Ep 3–183, 274–present)3–77, 274 Tony is an alcoholic and has a messy image. He often puts off cleaning his house that is designed like a convenience store.
Special members Name Episodes Notes / Ref. Kim Jong-min 56–57, 273–present He has a clumsy image and is concerned about his health so he takes a lot of supplements and vitamins. Tak Jae-hoon 69–present He is known as the semi-regular cast member of the show. His grumpy and sarcastic jokes are what makes him stand out. He is good friends with Lee Sang-min, Kim Jong-kook and Im Won-hee and often hangs out with them. 198–presentJung Suk-yong is Im Won Hee's close friend. They always spend time and travel together, hence winning the Best Couple Award at the 2020 SBS Entertainment Awards. Kim Jun-ho 213–presentKim Jun-ho has been divorced for 7 years. He often drinks and has hangovers but doesn't clean up his mess. He is the Vice Chairman of the club made by the cast members. Choi Si-won (Super Junior) 269-presentKim Gun-woo341-presentEun Ji-won386-present
Former Name Episodes Notes / Ref. Yoon Jung-soo 57 He is a foodie and tries by any means to lose weight. Yang Se-chan & Yang Se-hyung 72, 74, 98–100 Sam Okyere 73 Dok2 79 Seungri 89–90, 92, 94–95, 97 Jung Jae-hyung 102–103 106–107 Hong Jin-young 103–104, 113–114 Jun Jin 137–138 Eum Moon-suk 173–174 180 Jang Minho & Young Tak 190–193 Kim Ho-joong 194–195, 200, 202, 214 Kim Min-jong 218-219 Lee Hee Moon 235 Go Eun-ah 240–243 Kwak Si-yang 266–285 332-338 355, 357 Go Jun358 Woo Sang-hyeok368 Na Sun-uk380 Im Hyun-sik382, 387 Bae Sung-jae 397-398, 401 Youn Sung-ho 399 No Min-woo 402
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