2016–2017: Produce 101, Unpretty Rapstar and solo debut '' in 2016.|324x324px In January 2016, Soyeon appeared as a representative trainee for
Cube Entertainment in the first season of the girl group
talent competition show
Produce 101. She remained a popular contestant throughout the show's run, peaking at 10th place on the fifth episode. However, she ranked at number 20 on the last episode and failed to become a member of the winning project girl group,
I.O.I. In July 2016, Soyeon appeared as a contestant in the
third season of the rap competition show
Unpretty Rapstar. she finished the show as the second
runner-up, and three of her tracks were included on the show's final compilation album. On December 29, 2016, Soyeon signed an exclusive contract as an artist under Cube Entertainment. She officially debuted on November 5, 2017, with the digital singles "Jelly" and "Idle Song," which she wrote.
2018–2020: Debut with (G)I-dle, collaborations with League of Legends and solo activities " promotions in 2018.|334x334px On January 11, 2018, it was announced that Soyeon would be re-debuting in Cube Entertainment's new girl group
(G)I-dle, as a rapper and its leader. She was credited in writing the lyrics, music and arrangement for both their debut song "
Latata" and their next single "
Hann (Alone)", both of which were well received and commercially successful. She also helped write five songs from (G)I-dle's debut extended play
I Am. Station Young released their first song, "
Wow Thing", on September 28, 2018. After their debut, Soyeon and fellow (G)I-dle member
Miyeon were approached by
Riot Games to collaborate with American artists
Jaira Burns and
Madison Beer as part of the
virtual girl group
K/DA for the
multiplayer online battle arena video game
League of Legends. K/DA officially debuted with the song "
Pop/Stars" during the
2018 League of Legends World Championship on November 3. The official music video for "Pop/Stars" was released on the same day, reaching 30 million views on
YouTube in five days, and 100 million in one month. The
single release of the song reached number one on
Billboard's World Digital Songs chart. The K/DA incarnation of the character Akali, whose vocals were performed by Soyeon, proved to be especially popular, becoming a frequent subject of fan art and
cosplay. '' showcase in February 2019. In 2019, Soyeon composed labelmate
CLC's "No", which was selected through a blind test and served as the lead single of the group's EP
No. 1. In March 2019, Soyeon made a public apology for using a pirated version of the German music-producing software
Kontakt. She wrote on her online fan community site, "I deeply regret that I used an illegal copy of the program; as far as I remember, I used it when I first learned songwriting. I had not even recognized that I did not delete the program. But since the day I began composing in earnest, I have only used authorized programs." The apology came days after a behind-the-scenes YouTube video of preparing the
I Made EP, produced by the agency, showed icons of the software's illegal copy on her laptop screen. The agency later deleted the video and apologized. Soyeon reprised her role as Akali in the
League of Legends collaborative hip hop group True Damage. A collaboration with
Becky G,
Keke Palmer,
Thutmose and
Duckwrth titled "Giants" was released as a single alongside an animated music video on November 10, 2019. The song is a multilingual track performed predominantly in English, with verses in Spanish and Korean. On the same day, the group performed at the
2019 League of Legends World Championship finals in
Paris, France. It was Soyeon's second year in a row to perform at the opening ceremony of the World Championship finals. "Giants" debuted at number fifteen and nineteen at
Billboard's Rap and R&B/Hip hop Digital Songs Sales charts, respectively. In 2020, Soyeon guested on
Mnet's hip hop-inspired show
Do You Know Hip Hop, collaborating with
Double K and Nuck to perform a remix of "Lion". In April, (G)I-dle released their third EP,
I Trust. All of the songs on the album, including the lead single "
Oh My God", was written and composed by Soyeon and longtime collaborator
Yummy Tone. The lead single was released in both English and Korean. On July 22, Soyeon helped write and featured on
DJ Hyo's "Dessert" with rapper Loopy, a jungle pop song with "bouncy" beat and moombahton rhythm, synthesizer-based hook, claps and whistles, and lyrics expressing desire for a sweet love rather than a difficult and complex one. In an interview with
Melon, DJ Hyo revealed that she chose Soyeon as a collaborator because of her talents. In August, Soyeon composed (G)I-dle's first summer song, "
Dumdi Dumdi", alongside Pop Time, who had previously produced songs for rapper
Zico and the boy band
Block B. " in 2020. On August 27, 2020, Soyeon reprised her role as
League of Legends character Akali in "
The Baddest" and "
More", on K/DA's EP
All Out. Soyeon was credited as the producer of
Apink's
Namjoo solo debut song "
Bird", which was released on September 7. On December 16, it was confirmed that Soyeon,
Pentagon's
Hui, and
AB6IX's
Lee Dae-hwi would produce songs for the top seven competition on
Mnet's audition show
CAP-TEEN. Her song, "Eternal Sunshine", was performed by Lee Seo-bin. It was characterized as having "a groovy" guitar and bass rhythm with lyrics expressing the feelings of a first love. Lee received overall positive reviews and a total score of 354 from the judges for the performance.
2021–present: First solo EP Windy In January 2021, (G)I-dle released their EP
I Burn, including the lead single "
Hwaa"; Soyeon wrote four of the six tracks. The same month, Soyeon appeared on ''
, a KakaoTV original entertainment show revealing the everyday lifestyle of celebrities through their phones, which aired every Monday for three weeks from January 25. In the episodes, she revealed the production process of many of her songs, daily lives with (G)I-dle members, 1,600 demo songs, and behind-the-scenes video from the preparation of I Burn
to the day of its release. On May 21, 2021, it was reported that Soyeon would be releasing a solo album. On June 16, 2021, Cube Entertainment announced that her first EP, Windy'', would be released on July 5, with "
Beam Beam" serving as the lead single. Soyeon won her first
music program trophy on
SBS MTV's
The Show on July 13. On August 23, 2023, Soyeon collaborated with
LG Uplus and a
music video was released titled "I'm Okay" (), which garnered more than 9 million views on
YouTube in a week. On November 9, 2023, it was confirmed that Soyeon would be part of a special collaboration single "Nobody" with
Ive's
Liz and
Aespa's
Winter, which was released on November 16. On February 20, 2024, Soyeon, along with
Yena, was featured in the music video of "Sugar Rush" by
BIBI. Soyeon then
wrote and participated in
composing the title track for
QWER's second EP ''Algorithm's Blossom'', titled "My Name is Malguem" (), released on September 23, 2024, which secured the first music show win for the band. ==Artistry==