Choi Seung-youn

In 2019, Cho participated in the South Korean survival show Produce X 101. He finished in fifth place, making him a member of the show's derivative boy band, X1. He debuted with X1 under Swing Entertainment in August 2019.

Cho remained active in the music industry in the early months of 2019. In January, he co-produced the track "This Night", included on Groovy Room's single of the same name. The following month, boy group ONF released the track "Ice & Fire" on their third EP We Must Love, which Cho had co-written and produced. On March 4, 2019, the survival show Produce X 101 began filming; Cho was first revealed to be participating as a contestant two weeks later on March 20. However, he continued to work as a lyricist and producer while filming for Produce X 101, up until the show began airing in May 2019: in late March, singer-songwriter Suran released her second EP, Jumpin', for which he co-wrote and produced the title track "Don't Hang Up"; in April he co-produced "Blossom", a promotional song performed by VIXX's Ravi and GFriend's Eunha for Pepsi and Starship Entertainment's K-pop collaboration project "For the Love of It".

In the second episode of Produce X 101, Cho auditioned as one of three trainees representing Yuehua Entertainment with the self-written and produced song "Dream". He placed 67th in the show's first ranking in May 2019, and did not enter the top ten until the show's penultimate episode. Cho finished fifth in the finale on July 19, becoming the trainee with the lowest initial rank to earn a spot in the final lineup of the band X1, and the only trainee to consistently rise in rank over the course of the show. He debuted as a member of X1 on August 27, 2019, with the release of the EP Emergency: Quantum Leap.

He was first credited under the name WOODZ in February 2018 with the release of singer and producer EDEN's album RYU : 川, for which he co-produced the track "93" and featured on the track "Dance". As WOODZ, Cho continued to write and produce songs for other artists in the following months, beginning with the debut evaluation song "it's ok" for the Chinese survival show Idol Producer in April 2018. In July, he co-produced the single "ZIGZAG" for C-pop project group MR-X; he would also co-produce their next single "I Don't Wanna Fight Tonight", released two months later. In August, singer and musician Jun released his solo debut single "Hold It Down", which Cho wrote and co-produced. In the same month, he co-produced the song "Evanesce Ⅱ" for Super Junior-D&E's third EP 'Bout You. In October, R&B singer Babylon released the album Caelo, for which Cho co-wrote and produced the tracks "Sincerity" and "Drive".

Concurrent with his other musical activities, Yuehua Entertainment announced that Cho would officially start using the stage name WOODZ during his promotions as a soloist in May 2018. His first release as lead artist under the WOODZ name, the digital single titled "POOL", was released on May 12, 2018, followed by the single "DIFFERENT" on July 21 the same year. Both songs were co-produced by Cho with AOMG's Cha Cha Malone.

On October 23, 2018, the formation of his personal production team TEAM HOW was announced, with his Manager Lee Il Kyu, Stylist Kim Hyup, Designer Robbroy, M.O.L.A member NATHAN and etc. On October 27, 2018,The mini documentary film "HOW : how ordinary, we’re" was started to release.The digital single "meaningless" was released on November 3, 2018.

As a solo artist, Cho has been involved in writing all of his lyrics and producing most of his music. In the early stages of his career, Cho's musical style gravitated towards hip hop, with his releases under the name Luizy also incorporating pop and electronic music. However, the change of Cho's stage name as a soloist to WOODZ in 2018 was accompanied by a change in musical direction, described by Status Magazine as an "[evolution] into a more realized identity". As opposed to his "poppier" approach as Luizy, Cho characterizes his production style under the WOODZ name as "mostly [...] R&B", but mentions that he is "not picky about the genre". Commentators have also noted his experimentation with genres, with his music as WOODZ being identified as possessing elements of alternative R&B, atmospheric music, and dream pop while retaining a "signature climatic sound". In a further artistic contrast to his early career, which featured him primarily as a rapper, his releases as WOODZ feature Cho primarily as a vocalist. In retrospect, Cho described the difference between his personas as a "matter of maturity", with the change to the more "mature" WOODZ identity allowing him to distance himself from his "comparatively young" and immature identity as Luizy.

In November 2017, music publishing and production company ICONIC SOUNDS announced that Cho was one of the artists invited to participate in their annual songwriting and production camp. There, he met singer-songwriter Sophia Pae, with whom he would co-produce the song "Always". "Always" would then be featured on the survival show The Unit: Idol Rebooting Project in January 2018, where it was performed by the unit Blossom and released as a digital single as part of the show's fourth mission. This was Cho's first time producing a track for another artist; it also marked a brief transitional period in which he ceased using the name Luizy, as he was instead credited under his legal name for "Always".

Following an appearance on the fifth season of the South Korean rap competition show Show Me the Money, Cho first debuted as a solo artist under the stage name Luizy in July 2016, with the release of the collaborative hip-hop single "Recipe". Cho subsequently changed his stage name to WOODZ in 2018, reflecting changes in musical direction. His releases as WOODZ, including the singles "POOL", "DIFFERENT", and "meaningless", delved into alternative R&B, and featured Cho transitioning from rap to vocals. In addition to his solo work, he has written and produced songs for artists in both his native Korea and China, as well as for the shows The Unit: Idol Rebooting Project and Idol Producer.

Growing up, Cho was not fond of urban music such as K-pop and primarily listened to Korean ballad. However, when Cho began to experience homesickness while studying abroad, he turned to watching episodes of the South Korean music program Music Bank in order to cope. Inspired by the song "Let's Go On a Vacation" by Lee Seung-gi, he returned to South Korea to pursue a musical career. He enrolled in Hanlim Multi Art School in the Practical Dance Department, but started one year late due to his time overseas. After graduating from Hanlim in 2016, he was admitted to Dong-ah Institute of Media and Arts' Division of Entertainment in Broadcasting. He later transferred to Global Cyber University, enrolling in the Department of Entertainment and Media.

In 2016, Cho applied to participate in the rap competition show Show Me the Money 5; he had previously applied for the show's fourth season but was unable to participate due to conflicts with UNIQ's "EOEO" promotions. Although eliminated in the early rounds of the show, he drew positive attention from its viewership. After his appearance on Show Me the Money 5, he went on to co-found the production crew Drinkcolor alongside fellow producers EDEN, ODDTOM, and M.O.L.A member NATHAN on July 26, 2016. Cho then made his solo debut under the stage name Luizy three days later on July 29, with the self-produced hip-hop single "Recipe", a collaboration with fellow Show Me the Money 5 competitor Flowsik. He co-wrote the track with Flowsik, with whom he had struck up a friendship during the show's run. Following this, he released his first single as sole lead artist, "Baby Ride", on August 14, 2016; the title track featured BtoB member Im Hyun-sik. Cho collaborated with Im again in March 2017 for his first participation in an OST as a soloist with the single "Eating Alone", included on the OST for the music variety show Sing For You. Six months later, he made his first appearance as a featured artist on Lee Gi-kwang's song "Dream".

As the group's main rapper and sub-vocalist, Cho was involved in UNIQ's musical direction from their debut, penning his own rap verses as well as other lyrics for their Korean releases. When UNIQ's Korean promotions as a full group became more infrequent starting in the latter half of 2015 due to rising political tensions between China and South Korea, other members of the group began engaging in individual activities such as acting; however, Cho opted not to follow this career route, expressing a desire to focus on the musical aspect of his career. On August 14, 2015, the formation of the musical collective M.O.L.A was announced via the release of the song "My Way" on YouTube, featuring Cho as one of its founding members alongside 15&'s Park Ji-min and producer NATHAN. Three more members—Pentagon's Kino, Seventeen's Vernon, and guitarist Hoho—later joined the collective.

Cho auditioned more than 50 times to various entertainment companies such as SM Entertainment and JYP Entertainment before being accepted as a trainee at YG Entertainment. He had been training at YG for one and a half years before he joined the UNIQ pre-debut team. UNIQ, a multinational collaboration managed by Yuehua Entertainment, had its members cooperatively trained by both Chinese company Yuehua and South Korean company YG in the lead up to their official debut in both countries. Cho's first public appearance with UNIQ was on October 16, 2014, when the group performed on the music program M Countdown. The group's debut single "Falling in Love", recorded in both Mandarin and Korean, was released in both China and South Korea four days later on October 20. Their first mini album EOEO, also recorded in both Mandarin and Korean, was released in both countries on April 24, 2015.

Cho Seung-youn (Korean: 조승연 , born August 5, 1996), also known by the stage names Luizy and WOODZ, is a South Korean singer-songwriter, rapper, dancer, and record producer. He first rose to fame as the main rapper and sub-vocalist of South Korean-Chinese boy band UNIQ, formed by Yuehua Entertainment in 2014. He co-founded the musical collectives M.O.L.A in 2015 and Drinkcolor in 2016. In 2018, he co-founded his personal production team TEAM HOW.

Cho Seung-youn was born on August 5, 1996 in Seoul, South Korea. Raised as an only child, his parents both worked as businesspeople: his mother owned a Chinese restaurant in Cheongdam-dong as well as a travel agency in Sinsa-dong, both in the Gangnam district of Seoul; while his father owned a Korean restaurant in the Philippines. Due to his family's business obligations, he often moved during his childhood.