Season 4

Ha Joon-woo (Jump Rope Athlete), Kim Shin-wook (Writer), Kim Han-min (Film Director, Screenwriter), Park Eun-bin (Actress)

Moon Sang-hoon (Actor), Jang Won-seok (Film Producer), Jeong Na-rae (Choir Conductor), So Ji-sub (Actor)

Kim Gyeol (Cockroach Man),[8] Kim Han-kyeom (Professor), Lee Hye-ri (Actress), Joo Ho-min (Youtuber)

Bae Yu-jin (Model), Choi Won-ho (Stock trader, Park Tae-joon's Father-in-law),[9] Jin Seon-kyu (Actor), Lee Dae-ho (Former Baseball Player)

Paul Kim (Educator), Yoo Hong-joon (University Professor, Critic), Lee Seo-jin (Actor)

Jung Yoon (Ssireum Wrestler), Oh Se-yeon (Film Director), Lee Beom-sik (Professor), Yoo Hae-jin (Actor)

Cho Hye-seung (New Developer at Naver), Yoo Taek-geun (Tile Worker), Lois Kim (Employee at Google), Sean (Singer, Member of Jinusean)

Nam Yoo-jin, Bae Hye-ji, Oh Yo-anna (Weather Forecasters), Kim Boong-nyeon (Pediatrician), Son Suk-ku (Actor)

Park Jeong-ha (Survivor of the Bonghwa Mine Incident), Lee Dong-won (Producing Director), g.o.d (Boy Group)

Kim Sang-gyu (Pilot), NewJeans (Girl Group), Son Woong-jung (Football Coach, Father of Son Heung-min)

Oh Seung-hoon (Announcer), Class 6-1 of the Sungchang Elementary School, Choi Soo-hyuk & Kwon Ha-eun (Full Scorers of the 2023 CSAT), Kim Min-jae & Hwang In-beom (Footballers)

Jin Myeong (Buddhist Monk), Jin Kim (Protestant Pastor), Cha Paulus (Catholic Priest), Forestella (Music Group), Cho Gue-sung (Footballer)

Hwang Kwang-hee (Singer/TV Personality), Republic of Korea Emergency Rescue Team[g], Yoshihiro Akiyama/Choo Sung-hoon (Mixed Martial Arts Athlete)

Lee Ji-sun (Professor), Lee Do-hyun (Actor), Seong-Jin Cho (Pianist)

Choe Chang-ho (Descendent of Gyeongju Choe clan), Jeon Do-yeon (Actress)

Andrés Albiol (Locomotive Engineer), Lee Jin-ah (Police Officer), Kim Yong-jin (Hanbok Designer), Sung Si-kyung (Singer)

Han Jeong-sook (Dietitian), Yoon Soo-bin & Jang Hye-jin (Seoul National University Hospital Pharmaceutical Department), Kim Hee-ae (Actress)

Lee Chae-un (Snowboarder), Lee Byeong-heon (Movie Director), Lee Je-hoon (Actor)

Hong Yeon-jin (Artistic Swimmer & Cirque du Soleil Coach), Orbit (Science Content Creator)[h], Taeyang (Singer)

Lee Bo-mi & Kwak Eun-jin (Korea Sings Contestants), Epik High (Hip-hop trio), Kim So-yeon (Actress)

Lee Yu-jin (Head of Sleep Center), Kim Soo-jung (Cartoonist), Kim Woo-bin (Actor/Model)

Yoo Joon-ha (Footballer), Kim So-jeong (PD), Ryoo Seung-bum (Actor)

Lee Dong-kyu (Professor), Kim Hwan & Park Doo-re (Parents of quadruplets), Kang Chul-won (Zookeeper), Lee Geum-hee (Broadcaster)

Kim Woo-joo (Dance Boy), Jeong Dong-sik (Soccer Referee), Kim Yeon-koung (Volleyball Player)

Karimi Anwar (Iranian Expatriate), Moon Ki-ho (Army Surgeon), Uhm Jung-hwa (Singer/Actress)

Han Ho-yong (Home Shopping Mukbang Model), Kim Hyun-sook (Korea Sings Contestant), Jung Myeong-won (Daegu District Prosecutor's Office), Joo Hyun-young (Actress)

Lee Jung-tae & Oh Eun-seok (CEOs of Geekble), Cho Byung-young (Professor), Namkoong Min (Actor)

Sohn Sang-mo (Astronomer from Space Telescope Science Institute), Ahn Dae-sung (Vocal Therapist), Lim Ji-yeon (Actress)

Min Si-woo (Child Poet), Seo Ryeo-kyung (Doctor/Boxer), Lee Byung-hun (Actor)

Heo Joo-haeng (Beekeeper), Bae Soo-hyun (Cheerleader), Hwa Ji-ye (Youtuber), Kim Hee-sun (Actress)

Kim Ki-woong, Kim Kang-yeon & Kim Taek-yeon (Elementary School Teacher and Students), Angela Sen (Cognitive Behavioral Psychotherapist), Lee Dae-woo (Police Chief Superintendent of Seodaemun Police Station), Jung Yu-mi …

Kim Hwi-woo (Student), Yoon Soon-jin (Professor / Environmental Risk Expert), Cho Young-min (Professor / Diabetes Expert), Lee Joon-gi (Actor)

Cheon Jong-won (Boulderer), Shin Eun-su & Cho Yong-in (Developers of Terrorism Alert Application Terrorless), Kim Ki-ho & Park Soo-young (Gold Foil Decorators), V (Singer, Member of BTS)

Cho Sun-mi (Professor), Kim Jung-min & Kim Ja-hee (Owners of Starlite Deli), Gang Dong-won (Actor)

Kim Ye-bin, Park Ji-sol & Hong Yeon-woo (Members of Little K-Tigers), Seo Seung-ho & Cho Young-seok (Lotte World Tower Outer Walls Specialists), DEX/Kim Jin-young (Television Personality), Kim Nam-gil (Actor)

Pak Se-ri (Retired Golfer), Yoon Do-hyun (Singer-songwriter, vocal of YB)

Lee Da-seul (Voice Actress), Oh Sang-woo (Professor/Obesity Expert), Yang Jae-hoon, Lee Ho-joon, Kim Woo-min & Hwang Sun-woo (Swimmers), Oh Jung-se (Actor)

Koo Hee-ah (Korea Sings Contestant), Kim Kwang-woo (Professional Gamer), Kim Seong-mok (Weather Forecaster), Shin Hye-sun (Actress)

Shin Yu-bin (Table Tennis Player), Yoon Doo-yeon (Fireworks Designer), Yoo Byung-jae (Television Personality) & Yoo Kyu-seon (Manager of Yoo Byung-jae), Hwang Sun-hong (Manager of the South Korea national under-23 footb…

Lee Hyo-chul (Internet Personality/Slickback Expert) & Cheon Ae-jung (Mother of Lee Hyo-chul), Park Jin-young (Founder of JYP Entertainment) & Bang Si-hyuk (Founder of Big Hit Music & Hybe Corporation)

Seo Yong-sang (Baker), Kim Yong-man (Owner of Kim's Video and Music), Lee Eun-young & Kim In-hwan (Employees of Samsung Electronics), Choi Soo-jong (Actor)

Kim Ji-yoon (Professor/International Affairs Expert), Koo Cheol-soo (Teacher), Kim Ha-seong (Baseball Player), Im Soo-jung (Actress)

Seo Joo-hyang (Tightrope Walker), Oh Ji-hwan & Im Chan-kyu (Baseball Players), Yoo Yeon-seok (Actor)

Yang Young-chul (Professor/Health, Environment & Safety Expert), Seo Young-gab (Bodybuilder), Kim Ji-yoon (Professor/International Affairs Expert), Ha Ji-won (Actress)

Lee Jin-hyung (Professor at Stanford University), Kim Rok-ho (Director of World Health Organization Science Department), Ahn Eun-jin (Actress)

Kim Jung-ja (Eldest College Scholastic Ability Test Taker), Song Tae-wook (Police Officer), Park Seo-joon (Actor)

Lee Chae-hyun & Kim Ye-hwa (Daejeon Girl's Commercial High School Graduates), Yoo Eui-bae (Priest), Faker (Professional League of Legends Gamer)

Suh Jin-kyu & Cho Sung-ah (Mother & Daughter / Formerly of United States Forces Korea and Harvard University), Kim Chang-ok (Speaker/Communication Expert), Jang Na-ra (Actress, Singer)