The year he turned 25, he posted the first video on the YouTube channel BDNS with his friends Kim Jin-hyuk and Kang Hong-seok. He had graduated in business administration from Ajou University and served in KATUSA.
The breakthrough yearThe year he turned 26, in December, he appeared in Munhagui Bam (“Literature Night”) on the YouTuber Yoo Byung-jae’s channel and began to draw attention.
In 2018, he gained attention as Teacher Moon. In 2019, he collaborated with Albamon, and a collaboration series with Ahn Young-mi passed 1 million views.
In 2020, he appeared in the web variety show Gangnam-daero, and a collection made with Millet Classic ranked first and second on Musinsa. He was also questioned by prosecutors after a report that mistook his fake soldier vlog for a real soldier’s.
In 2021, he appeared in Tving’s Girls’ High School Mystery Class and made his drama debut in JTBC’s Off the Course, and he played Kim Ruri in Netflix’s D.P. season 1.
In 2022, he made a special appearance in Extraordinary Attorney Woo as Jung-hoon, a defendant on the autism spectrum. With more than 1 million subscribers, he also collaborated with the Seoul Tourism Organization.
In May 2023, on his birthday, he announced his marriage. D.P. season 2 was released, and in September he ruptured his Achilles tendon during a professional baseball first pitch but finished the pitch.
In 2024, he published his first essay collection and made a special appearance in the film Pilot. He also hosted SNL Korea season 6. In 2025, he said he was to have surgery for a vocal cord polyp, and his channel passed 2 million subscribers. He won Best New Male Entertainer at the Blue Dragon Series Awards and held a solo show at the Sejong Center.
In 2026, he showed his new four-story office building for the first time on Omniscient Interfering View. He also made a special appearance as an audition director in the film Coming of Age.
Moon Sang-hoon (born May 9, 1991) debuted on Jun 20, 2016, the year he turned 25, with the first video on the YouTube channel BDNS, and became known in Dec 2017, the year he turned 26, when he appeared in Munhagui Bam on Yoo Byung-jae’s YouTube channel. He won Best New Male Entertainer at the Blue Dragon Series Awards in 2025, the year he turned 34.
Ages are by calendar year (the year minus the birth year), birthdays aside.
Graduated in business administration from Ajou University and served in KATUSA. Posted the first video on the YouTube channel BDNS with his friends Kim Jin-hyuk and Kang Hong-seok.
Source 02 · My Daily (Korean) · 2 million subscribers · opens in a new tabSource 01 · Gukje News (Korean) · Moon Sang-hoon profile · opens in a new tabSource 28 · Newsis (Korean) · How BDNS grew · opens in a new tabBegan to draw attention from viewers in their teens and twenties by appearing in Munhagui Bam (“Literature Night”) on the YouTuber Yoo Byung-jae’s channel, under the nickname “Munhagui Bam cheat key.” He went on to appear on MBC Every1’s Video Star and in a Lotteria commercial.
Became popular on YouTube as Teacher Moon, a star Korean geography tutor. Made a video cheering on exam takers two weeks before the college entrance exam.
Source 05 · Bizhankook (Korean) · Teacher Moon cheers on exam takers · opens in a new tabSource 28 · Newsis (Korean) · How BDNS grew · opens in a new tabCollaborated with the part-time job portal Albamon on a video in which Teacher Moon explained work contracts and weekly holiday pay.
Source 06 · Etoday (Korean) · Albamon x BDNS · opens in a new tabA YouTube collaboration series with the broadcaster Ahn Young-mi passed 1 million views.
Source 07 · Herald Business (Korean) · Ahn Young-mi collaboration passes 1 million views · opens in a new tabBegan appearing in the web variety show Gangnam-daero with the entertainer Kangnam.
Source 08 · Newstown (Korean) · Gangnam-daero · opens in a new tabSaid he had been unable to post videos for two months because he was questioned by prosecutors after a report that mistook his fake soldier vlog, “Private First Class Moon, a Soldier of Concern,” for a real soldier’s.
Source 09 · Insight (Korean) · Private first class vlog incident · opens in a new tabReleased a collaboration collection with the fashion brand Millet Classic, which ranked first and second in Musinsa’s product rankings at launch.
Source 10 · Etoday (Korean) · Millet Classic collaboration · opens in a new tabAppeared as Kim Jung-ho in the Tving original Girls’ High School Mystery Class.
Source 11 · Newsen (Korean) · Girls’ High School Mystery Class · opens in a new tabMade his drama debut as Noh Jeong-yeol in Off the Course, a two-episode drama in JTBC Drama Festa 2021. His character threatens a mother and daughter to get wedding gift money.
Source 12 · Sports Seoul (Korean) · Off the Course · opens in a new tabSource 29 · Newsen (Korean) · Off the Course drama debut · opens in a new tabAppeared as Kim Ruri in Netflix’s D.P. season 1. Kim Ruri fires a gun in the season 1 ending.
Source 13 · News Inside (Korean) · D.P. season 2 release · opens in a new tabSource 04 · SPOTV News (Korean) · The funny people · opens in a new tabMade a special appearance in episode 3 of Extraordinary Attorney Woo as Jung-hoon, a defendant on the autism spectrum. The episode’s 4% rating was the highest for a drama on the cable channel ENA to that point.
Source 14 · Singlelist (Korean) · Extraordinary Attorney Woo, Jung-hoon role · opens in a new tabSource 15 · Yonhap News Agency (Korean) · Extraordinary Attorney Woo episode 3 ratings · opens in a new tabWith 1 million subscribers, he appeared in a promotional video made with the Seoul Tourism Organization. As the reporter character Moon Sang, he tried augmented reality Seoul travel content.
Source 16 · Discovery News (Korean) · Seoul Tourism Organization collaboration · opens in a new tabAnnounced his marriage on his birthday. His spouse is not in the entertainment industry.
Source 17 · Gukje News (Korean) · Marriage announcement · opens in a new tabD.P. season 2 was released. In it, Private First Class Kim Ruri opens fire and deserts with a weapon after hearing news of a friend who enlisted alongside him.
Source 13 · News Inside (Korean) · D.P. season 2 release · opens in a new tabSource 18 · MHN Sports (Korean) · D.P. 2, Kim Ruri · opens in a new tabRuptured his Achilles tendon while throwing the ceremonial first pitch at a game against the NC Dinos, but finished the pitch.
Source 19 · Newsen (Korean) · First pitch one year after Achilles tendon rupture · opens in a new tabPublished his first essay collection, Naega Han Mareul Naega Ohaehaji Ankiro Ham (“I Decided Not to Misunderstand What I Said”), with Winners Book.
Source 20 · Korea Lecturer News (Korean) · First essay collection · opens in a new tabMade a special appearance in Pilot, starring Jo Jung-suk.
Source 21 · Star News (Korean) · Pilot cameo · opens in a new tabAppeared as host of episode 4 of Coupang Play’s SNL Korea season 6.
Source 22 · Etoday (Korean) · SNL Korea host · opens in a new tabSaid he was to have surgery for a vocal cord polyp.
Source 23 · OSEN (Korean) · Vocal cord polyp surgery · opens in a new tabThe YouTube channel BDNS passed 2 million subscribers, about nine years after the first video in 2016.
Source 02 · My Daily (Korean) · 2 million subscribers · opens in a new tabWon Best New Male Entertainer for Blank Menu for You at the 4th Blue Dragon Series Awards.
Source 24 · Hankook Ilbo (Korean) · Blue Dragon Series Awards · opens in a new tabHeld the solo show Moon Sang-hoon and BDNS at the Sejong Center S Theater. All seats, including restricted-view seats, sold out over three days.
Source 25 · Munhwa Ilbo (Korean) · Sejong Center show · opens in a new tabAppeared in his first observational variety show, MBC’s Omniscient Interfering View, and showed his new four-story office building for the first time.
Source 26 · MBC Entertainment (Korean) · New office building · opens in a new tabMade a special appearance as an audition director in Coming of Age, a film that won two awards at the Busan International Film Festival.
Source 27 · bnt News (Korean) · Coming of Age cameo · opens in a new tabEND OF SELECTED RECORDSSelected records, 2016–2026 · not a complete list of work. “Key moment” is an editorial label, not a measure of success.
What did they do, and at what age?
AgeTrail lines up the key moments of a life by age.
Debut and breakthrough are marked separately, and every record has a source.
Internet · South Korea
May 9, 1991 —
Ages are counted from the birth year 1991: the year of the event minus 1991, birthdays aside. “Key moment” labels and the connecting story are AgeTrail's editorial reading.
Fact-checked: 2026.09.28 · An independent archive, not affiliated with the person or their agency.