|Real Name:||Do Kyung-soo|
|Alternative Spelling(s):||도경수, 都暻秀|
|Date of Birth:||January 12, 1993|
|Place of Birth:||Goyang, Gyeonggi Province, South Korea|
|Associated Acts:||EXO, EXO-K, SMTOWN|
|Affiliations:||EXO member, EXO-K member|
Do Kyung-soo (도경수), better known as D.O. (디오), is a lead vocalist of EXO-K.
- Stage Name: D.O. (디오)
- Real Name: Do Kyungsoo (도경수)
- Chinese Name: Dōu Jǐng Xiù (都暻秀)
- Nicknames: Heenjabuja (rich in whites)
- Bloodtype: A
- Height: 173cm
- Weight: 59kg
- Skills: Singing, beat box
- Super Power (Badge): Earth
- Zodiac Sign: Capricorn
- Chinese Zodiac Sign: Monkey
- Family: Father, Mother, Older brother
Kyungsoo was born on January 12, 1993 in Goyang, Gyeonggi Province, South Korea to a couple whose names are undisclosed. He has an older brother, Do Seungsoo.
Kyungsoo is known for his singing skill, he has been singing since primary school and was an avid participant in local singing competitions throughout his high school career. In 2010, he was recommended to audition for S.M. Entertainment after winning at a local singing festival. He subsequently became an S.M. Entertainment trainee during his last two years of high school. He performed Na Yoonkwon's "Anticipation" and Browneyed Soul's "My Story" at his S.M. audition.
Kyungsoo was formally introduced as the eighth member of EXO on January 30, 2012. His stage name is derived from his family name, Do. He sees Yoo Youngjin, S.M.'s music producer, as his role model. In July 29, 2013, he was featured in f(x)'s song "Goodbye Summer", a track from their album Pink Tape. D.O. also made his feature film debut in the movie Cart, playing as a high-school student. The movie premiered at the 2014 Toronto International Film Festival in September.