The year he turned 17, he began on YouTube as the character Quaddurup, presented as a Korean American from San Francisco. In April 2017, Sports Seoul introduced Jang Ji-su as a video creator in his final year at an international school. In 2018, he started the “interview” content, in which YouTubers and entertainers apply to work at Quaddurup’s company. In 2019, he spent time with fans at DIA Festival in Busan.
The breakthrough yearThe year he turned 21, he took part as a trainee in the YouTube web show Fake Men season 1. Money Today wrote that he gained popularity with the public through the appearance. That November, he appeared in the alter-ego contest as the rapper QDR.
In 2021, he hosted Tell Me Something with Shindong, and in September he said he would stop appearing as the character and work under his real name, Jang Ji-su. In October, the web show Gongbeom, which he helped plan, was released, and in December he posted a return video on his real-name channel. In 2022, he featured on DAVII’s “Geunomui Don,” took part in TVING’s Treasure Hunt and, in December, hosted Gongbeom 2. In 2023, he became an ambassador for the esports company SBXG.
In January 2024, he appeared on MBC’s King of Mask Singer, and in August Netflix’s The Influencer, in which he took part, was released. In August 2026, the year he turned 27, he appeared on the YouTube channel Egennam Swings.
Quaddurup (real name Jang Ji-su, born Dec 8, 1999) began on YouTube in Nov 2016, the year he turned 17, and became known in 2020, the year he turned 21, by appearing in the web show Fake Men season 1. In 2021, the year he turned 22, he ended the character and announced a return to his real name.
Ages are by calendar year (the year minus the birth year), birthdays aside.
Began as the character Quaddurup, presented as a Korean American from San Francisco. The character mixed English into his speech.
Source 01 · Topstarnews (Korean) · Announces end of broadcasts · opens in a new tabSource 02 · Newsis (Korean) · Jang Ji-su interview · opens in a new tab The start date follows Topstarnews, which gives November 2016. The day was not confirmed.Sports Seoul introduced Jang Ji-su as a video maker in his final year at an international school. The article says he planned to study in the United States that September.
Source 03 · Sports Seoul (Korean) · High school student, one-person media · opens in a new tab The age in the article is 19 (Korean age). This page counts by the calendar-year age.First showed content in which YouTubers and entertainers apply to work at Quaddurup’s company.
Source 04 · TV Daily (Korean) · Jang Ji-su’s fresh start · opens in a new tab The article gives no month or day.On the second day of the event held by DIA TV, CJ ENM’s support program for one-person creators, spent time with fans together with the YouTuber Sini.
Source 05 · Ajunews (Korean) · DIA Festival 2019 · opens in a new tabTook part as a trainee in YouTube content in which participants go through MUSAT’s Navy Special Warfare Flotilla training course. Money Today wrote that he gained popularity with the public through the appearance.
Took the stage as the rapper QDR in episode 4, released on YouTube. He had earlier tried out for Show Me the Money 9 and been eliminated.
Source 11 · Newsen (Korean) · Alter-ego contest · opens in a new tabShowed in a video a new office with a filming studio and a bedroom. He had 1.31 million subscribers.
Source 12 · Topstarnews (Korean) · New studio revealed · opens in a new tabA car music talk show hosted with Shindong of Super Junior, co-produced by SM C&C and DBDB Lab. It was released first on Kakao TV.
Source 13 · Money Today (Korean) · Production support for Tell Me Something · opens in a new tabOn a channel with 1.3 million subscribers, he said he would stop appearing as the character Quaddurup and work under his real name, Jang Ji-su. By his own account, five years as the character had become mentally burdensome.
Source 04 · TV Daily (Korean) · Jang Ji-su’s fresh start · opens in a new tabSource 08 · Money Today (Korean) · Retires from YouTube · opens in a new tabSource 09 · Xportsnews (Korean) · Announces return as himself · opens in a new tabA DIA TV original built around a mafia game, with a prize of 100 million won for the last winner. Quaddurup took part in planning it.
Source 14 · Global Economic (Korean) · Gongbeom released · opens in a new tabCo-hosted with MiMiMiNu and Jonathan. Episode 1 of the FLO original audio content was released that day.
Source 15 · Sports Donga (Korean) · Florida Project · opens in a new tabPosted a video titled “It’s been a while. I’m Jang Ji-su.” Insight gives his birth date as Dec. 8, 1999.
Source 16 · Insight (Korean) · Jang Ji-su resumes YouTube activity · opens in a new tabDAVII revealed Jang Ji-su (Quaddurup) as the last featuring artist of the fourth mini album, GENEZIS3. He took part in the double title track “Geunomui Don.”
Source 17 · Xportsnews (Korean) · DAVII featuring lineup · opens in a new tabOne of 24 participants in a survival show played for 500 million won in cash.
Source 18 · Xportsnews (Korean) · Treasure Hunt press conference · opens in a new tab The date is the release date announced in the press-conference article. The actual release was not confirmed.Continued as host from season 1. Ten people took part, including Agent H and Lim Yo-hwan.
Source 19 · Slist (Korean) · Gongbeom 2 first episode · opens in a new tabSBXG said he joined as an ambassador, not as a player. The role is to represent the teams under SBXG.
Source 20 · Bloter (Korean) · Joins SBXG · opens in a new tabLost to Bungsegwon 89 to 10 in the first round and revealed his identity. He said that day that he is from Ilsan, Gyeonggi Province.
Source 21 · MBC Entertainment (Korean) · King of Mask Singer · opens in a new tabSource 22 · Maeil Business Newspaper (Korean) · King of Mask Singer, Jang Ji-su · opens in a new tabWas listed as a participant in the Netflix social survival show in which 77 influencers compete on influence. It was released at 4 p.m. that day.
Source 23 · YTN (Korean) · The Influencer press conference · opens in a new tabIn a video featuring the singer Kim Hee-chul, asked about Super Junior’s revenue settlement.
Source 24 · MHN Sports (Korean) · Kim Hee-chul on income shares · 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
Dec 8, 1999 —
Ages are counted from the birth year 1999: the year of the event minus 1999, birthdays aside. “Key moment” labels and the connecting story are AgeTrail's editorial reading.
Fact-checked: 2026.10.05 · An independent archive, not affiliated with the person or their agency.