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As an actor, Doh has starred in various television dramas and movies such as It's Okay, That's Love (2014), My Annoying Brother (2016), Along with the Gods: The Two Worlds (2017), 100 Days My Prince (2018), Swing Kids (2018), Bad Prosecutor (2022), and The Manipulated (2025). In recognition of his acting, he was selected by the Korean Film Council as one of the 200 Korean actors that best represent the present and future of Korea's movie scene.

Doh Kyung-soo was born on January 12, 1993, in Nonhyeon-dong of Gangnam District, Seoul, South Korea, and grew up in Ilsandong District of Goyang, Gyeonggi Province. He went to Goyang Poongsan Elementary School, Baekshin Middle School, and Baekseok High School. He has an older brother who is three years older than him. Doh began singing in primary school and was an avid participant in local singing competitions throughout his high school career. After winning one of the competitions, he was advised to audition for SM Entertainment. He performed Na Yoon-kwon's "Anticipation" and Brown Eyed Soul's "My Story" at his audition. Doh subsequently became a trainee during his last two years of high school.

Doh was formally introduced under his stage name D. O. as the eighth member of Exo on January 30, 2012, with the release of the Korean version of the single "What Is Love", sung by him and Baekhyun. The group debuted on April 8 with the EP Mama. In July 2013, he was featured in the song "Goodbye Summer" from f(x)'s second studio album Pink Tape. In September 2014, Doh made his acting debut with a supporting role in the movie Cart, playing a high school student and son of a grocery store worker and union member (played by Yum Jung-ah). The movie premiered at the 2014 Toronto International Film Festival. He also released an original soundtrack titled "Crying Out" for the movie.

Later in 2014, Doh made his small screen debut playing a supporting role in the SBS drama It's Okay, That's Love, which starred Gong Hyo-jin and Zo In-sung. He was praised by film critic Heo Ji-woong for his performance in the series, and was later nominated for the Best New Actor award at the 51st Baeksang Arts Awards. In June 2015, Doh featured in KBS' drama Hello Monster, playing a psychopath. In November 2015, Doh was nominated for the Best Supporting Actor award at the 52nd Grand Bell Awards for his role as Tae-young in Cart.

In January 2016, Doh was announced as one of the cast of voice actors for the feature-length animated film Underdog, which premiered in 2019. He voiced Moongchi, a stray dog who is separated from his owner. In February 2016, he collaborated with Yoo Young-jin on a duet titled "Tell Me (What Is Love)" for SM Station Season 1. He had previously performed a short version of the song as a solo performance throughout Exo's first concert tour. Later in February, Doh starred as the male lead alongside actress Kim So-hyun in the romantic film Pure Love. In October 2016, Doh starred alongside Chae Seo-jin in the web drama Be Positive. The series became the most watched Korean web drama of all time.

In November 2016, Doh starred alongside Jo Jung-suk and Park Shin-hye in the film My Annoying Brother, playing a national level Judo athlete. He and Jo also recorded the ending theme song, titled "Don't Worry" for the movie. Doh was awarded the Blue Dragon Film Awards Best New Actor award a year later for his performance in the film.

In 2017, Doh starred in the comedy thriller film Room No.7. The same year, he played a supporting role in Kim Yong-hwa's film Along with the Gods: The Two Worlds, a blockbuster adaptation of the webtoon of the same name, about a court in the afterlife where the deceased undergo multiple trials for 49 days. In December 2017, Doh attended the Macau International Film Festival alongside director Choi Dong-hoon as a Korean public relations ambassador.

In 2018, Doh starred in Swing Kids, a film set in a prison camp in South Korea during the Korean War. He plays a North Korean soldier who falls in love with tap dancing in the midst of all the chaos. Later that year, he was cast in his first small-screen leading role, playing a crown prince in 100 Days My Prince. The series was a commercial success, becoming the fifth highest-rated Korean drama in cable television history and in 2020, became the first CJ ENM drama to be broadcast in Japan's public television channel, NHK General TV.

Military service:

In May 2019, Doh was reported to be among the conscripted soldiers for July, to the surprise of many. Shortly after the news, he posted a handwritten letter on EXO's official fan club confirming and announcing his upcoming enlistment for South Korea's mandatory military service. He enlisted as an active duty soldier on July 1, 2019. On the same day, he released the single "That's Okay," a song that he co-wrote, through the SM Station project as a gift for his fans. After completing his training, he served at the Capital Mechanized Infantry Division (Fierce Tiger Division) as a food handler (kitchen police).

In 2020, Doh participated in the Taegeukgi (Korean Flag) Campaign for the 70th anniversary of Korean War and was cast in a commemorative rerun of the original military musical Return: The Promise of the Day, playing the role of young Seungho, marking it as his musical theater debut. A special run of the musical was broadcast live via Naver TV on June 10, 2020. Due to COVID-19 protocols, in-person performances were cancelled and shifted to online broadcast between September 24 to 26, 2020.

During his service, Doh also participated in Military Manpower Administration's "I Am Proud" campaign. He was also selected in the South Korea's Ministry of Justice awareness campaign against "Digital Sexual Exploitation".

After taking his final military vacation leave in December 2020 without returning to his base in compliance with the army's protocols regarding the COVID-19 pandemic, Doh was officially discharged on January 25, 2021.

2021–present: Return to acting, solo debut and departure from SM Entertainment:

In October 2020, prior his discharge, Doh was announced to be cast in Kim Yong-hwa's next film, The Moon, where he will play the lead role of Hwang Seon-woo, an astronaut left in space due to an unforeseen accident. Filming began on June 6, 2021, and concluded on October 12, 2021. The film was released in August 2023.

In February 2021, Doh was announced to have been cast as the male lead in Secret: Untold Melody, a South Korean remake of the 2007 Taiwanese film Secret by Jay Chou. In the film, he played Yu-jun, a piano prodigy who crosses paths with Won Jin-ah's character Jung-a. The filming began in November 2021 and wrapped in January 2022. The film was released on January 27, 2025. In March 2021, Doh was selected as one of the 200 actors for "The Actor is Present" campaign by the Korean Film Council (KOFIC) to represent the past and present of the Korean Cinema. His profile was unveiled in May 2021. On June 25, 2021, SM Entertainment announced that Doh would release his first solo album at the end of July 2021.

His first EP Empathy was released on July 26, along with its lead single "Rose." Doh had participated in writing the lyrics for his lead single, "Rose" and "I'm Fine". The album topped the Gaon Album Chart.

In 2022, Doh was announced as the next actor to feature in the 2-episode travel show by Discovery Channel Korea, Off The Grid, where he took a 3 days, 2 nights solo roadtrip to Namhae and the southern side of South Korea. His episodes aired in May 2022. Doh made his return to the small screen with KBS2 drama series, Bad Prosecutor in October 2022, where he played the lead role of Jin Jung, a delinquent prosecutor who fights for justice. He earned Top Excellence Award (Actor) in the 2022 KBS Drama Award for his performance.

In 2023, Doh appeared in SBS's variety show, No Math School Trip by former director of Running Man, Choi Bo-pil, along with Zico, Crush, Choi Jung-hoon, Lee Yong-jin, and Yang Se-chan. On September 1, SM announced that Doh would release his second EP, Expectation, on September 18. On October 18, 2023, it was announced that Doh would be leaving SM Entertainment and joining a new agency, Company SooSoo, established by his long-time manager Nam Kyung-soo for his personal activities. However, he will continue his activities as an Exo member with SM Entertainment. On November 13, 2023, Doh was confirmed to be cast in the main role in Disney+ series The Manipulated.

On January 3, 2024, an official from Company SooSoo confirmed that Doh was preparing his third solo album to be released in the first half of the 2024. In April 2024, Doh announced his third EP Blossom would be released alongside its lead single "Mars" on May 7. He later embarked on an Asian fan concert tour, titled Bloom, that began on June 8, 2024, in Seoul.

On April 11, 2025, Company SooSoo announced that Doh would embark on another tour across Asia for a concert titled Do It! that would begin on July 19, 2025 in Seoul, South Korea. In June 2025, Doh announced his first studio album, titled Bliss, which was released on July 7, 2025. He co-wrote lyrics for the album's lead single "Sing Along!" with Zico, one of the song's composers. On September 8, 2025, Company SooSoo announced that Doh would release a digital single he co-wrote titled "Dumb" featuring rapper Penomeco on September 16. On November 4, 2025, it was announced that Doh would not be renewing his contract with Company SooSoo following its recent expiration, but that the company would continue to support his upcoming Do It!

tour dates on December 6 and 7, 2025 in Seoul. The CEO of Blitzway Entertainment confirmed on November 5, 2025 that Doh signed a contract with their company to support his acting endeavors alongside his solo and group musical activities.

On September 8, 2026, he released his fourth EP Dopamine, ahead of his Asia concert tour in October.

Discography:

Bliss (2025)