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2013–2015: Pre-Debut
In 2013, Doyoung became a trainee through SM Entertainment's Casting System after being scouted at a singing competition.

In 2015, he was introduced as a member of SM's pre-debut training team, SM Rookies as he became an MC on MBC Music's Show Champion alongside fellow SM Rookie, Jaehyun. They hosted the program from January 21st to July 1st, 2015.

2016–Present: NCT and solo endeavors
In April 2016, SM Entertainment confirmed Doyoung alongside five other members of the SM Rookies program to debut as members of NCT and its first sub-unit, NCT U. Doyoung debuted with the digital singles "The 7th Sense" alongside Taeyong, Ten, Jaehyun and Mark on April 9th and "Without You", alongside Taeil and Jaehyun on April 10th.

In July 2016, Doyoung collaborated with Shinee's Key on the song "Cool", for the soundtrack of OCN drama, 38 Squad. This marked his first solo endeavour since debuting under NCT.

In November 2016, he joined the main cast of OnStyle's beauty variety show, Lipstick Prince.

In early December, he collaborated with his labelmate Joy of Red Velvet on the song "First Christmas", for Inkigayo Music Crush. Also in December, he was announced as a member of NCT 127, a sub-unit of NCT. On December 30, 2016, he released the song "Sound of Your Heart" (너의 목소리) for the SM Station project.

His official debut as a member of NCT 127 took place in January 2017, with the release of the EP Limitless.

In February 2017, he became Inkigayo's MC, alongside Park Jin-young and Kim Ji-soo. In March of the same year, he made an appearance on the MBC program We Got Married as an entertainer (Ep.363). From March to April, he starred in NCT Life, appearing in its sixth season, entitled NCT Life in Chiangmai.. From June to July of that year, he also appeared in the seventh season of the NCT Life in Osaka.

On August 7, he released the song "Stay in my Life" for the School 2017 soundtrack, along with Taeil and Taeyong. On October 13, he released the song "Star Blossom" (별빛 이 피면), through the second season of SM Station, in collaboration with Kim Se-jeong.

2018–2019: His first concert tour with NCT, UNICEF
In January 2018, he released the soundtrack for the drama of the same name "Radio Romance", in collaboration with Taeil. The mid-tempo rock song was written by Park Geun-chul, Runy and Jung Soo-min, and reflects the drama's purpose of using radio as a means to bring a more analog feeling to a digital world. The following month he departed as an MC of Inkigayo, where he had presented for a year.

In June 2018, he released the soundtrack for the drama Rich Man, "Hard for me". "Hard for Me" was originally sung by CHEEZE and was the first song released for the drama, which was later re-recorded by Doyoung.

On March 14, NCT released its first full-length album, NCT 2018 Empathy.

In the July 2018 issue of the South Korean magazine Arena Homme+, he featured the front page alongside Johnny and Jaehyun.

On September 6, on the Youtube channel of the SM TOWN his Bazzi's "Mine" was released. In mid-September, SM Entertainment announced that NCT 127 would release its first studio album, entitled Regular-Irregular. On Drecember 22 and 23, on the Youtube channel of NCT MUSIC his covers of Ariana Grande's "Breathin" and Bing Crosby's "White Christmas" appeared.

In January 2019, he co-starred in the Star Road: NCT 127 program, alongside other members of NCT 127. He particpated in NCT 127's first concert tour, Neo City – The Origin which began in late January. On March 6, he released the song "Don't say goodbye" (헤어 지지 말아요, 우리) in collaboration with the indie duo Rocoberry.

In 2019, Doyoung released several covers through NCT's YouTube channel, NCT Music, IU's "Dear Name" in March, Billie Eilish's "'Wish You Were Gay' with 'Bad Guy'" in May, Billie Eilish's "idontwannabeyouanymore" in June, and Taeyeon's "Rain" in July and then her song "This Christmas" in December.

In June and July of the same year, he appeared on the "King of Mask Singer" under the name "Assistant Manager" competing in Episodes 209 and 210, respectively, where he won all Three Rounds but was defeated by Nightingale (Lee Bo-ram), causing Doyoung to reveal his identity. After his revelation, Doyoung said that he wanted to appear on the show after seeing Luna performance. He also commented: "I feel a sense of pride as an Idol Vocalist. I think I was able to take the first steps towards achieving my goals, making it all the way here, being an idol vocalist."

In between June-July, he starred in the NCT 127 variety show Teach Me JAPAN!. In August he was cast on the SBS reality show Law of the Jungle. Also in August, he released the song "New Love", along with Jaehyun, for the soundtrack to the web drama When You're on the Blacklist of Bullies. In September, he appeared on the NCT 127 American School 101 program.

In October, he collaborated on the soundtrack for the drama The Tale of Nokdu, together with Mark and released the song "Baby Only You". On October 27, he and group mate Haechan posted a cover of Indonesian song "Cinta Luar Biasa" by Andmesh Kamaleng.

The following month, Doyoung collaborated with BoA, Siwon, J-Min, Sunny, Taemin, Suho and Wendy as part of SM Town on the song "This is Your Day (for every child, UNICEF)". The song was officially released on November 20, as the first track of the Station X 4 Loves for Winter, the 2019 SMTOWN winter project. "This is Your Day" is a pop ballad track with dynamic chord progressions. The lyrics was written by Yoo Young-jin and expresses his hopes that all children will be happy.

2020–present: Other activites
In December 2019, he participated in the NCT Life in Chuncheon & Hongcheon.

In April, he covered "Give You My Heart" from the soundtrack for "Crash Landing on You" originally sung by IU.