(D.O) Do Kyun Soo

디오     도경수 

EXO

D.O. was born in Goyang, Gyeonggi Province, South Korea, on January 12, 1993. He went to Goyang Poongsan Elementary School, Baekshin Middle School, and Baekseok High School. He has an older brother, Do Seungsoo, who is 3 years older than him. 

D.O. began singing in primary school and was an avid participant in local singing competitions throughout his high school career. In 2010, he was advised to audition for S.M. Entertainment after winning a local singing contest. He subsequently became an S.M. Entertainment trainee during his last two years of high school. He performed Na Yoon-kwon's "Anticipation" and Brown Eyed Soul's "My Story" at his S.M. audition.

D.O. was formally introduced as the eighth member of EXO on January 30, 2012. The group officially debuted on April 8 with the extended play 'Mama'. In July 2013, he was featured in the song "Goodbye Summer" from f(x)'s second studio album 'Pink Tape'. In December 2013, D.O., along with fellow Exo members Baekhyun and Chen, sang the title track for the group's second EP 'Miracles in December'.

In September 2014, D.O. 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, D.O. made his small screen debut playing the supporting role oin the SBS drama 'It's Okay, That's Love', which starred Gong Hyo-jin and Jo In-sung. For his performance in the drama, D.O. was later nominated for the Best New Actor and Popularity awards at the 51st Baeksang Arts Awards. 

Late May 2019, D.O announced his upcoming enlistment for South Korea's mandatory military service by posting a handwritten letter on Exo's official fan club. He enlisted as an active duty soldier on July 1, 2019, and served at the Capital Mechanized Infantry Division (Fierce Tiger Division) as a food handler (kitchen police). On the same day, he released the single "That's Okay", a song that he co-wrote, through the SM Station project. 

In 2020, D.O. made his musical theater debut in a rerun of the original military musical Return: The Promise of the Day, playing the role of Seungho.

On October 18, 2023 it was announced that D.O would be leaving SM Entertainment to create his own agency called 'Company Soosoo'. Upon this reveal it was stated that D.O would still be promoting with and a part of the group EXO.