It was Soyeon's second year in a row to perform at the opening ceremony of the World Championship finals. On the same day, the group performed at the 2019 League of Legends World Championship finals in Paris, France. The song is a multilingual track performed predominantly in English, with verses in Spanish and Korean. It was a collaboration between Soyeon, Becky G, Keke Palmer, DUCKWRTH, and Thutmose.
On November 10 2019, newly formed group "True Damage" debuted with the music video for "GIANTS" released. The single release of the song "Pop/Stars" reached number one on Billboard's World Digital Songs chart. Soyeon plays the role of "Akali" in the group, which is a character in the League of Legends videogame. This collaboration project, named "K/DA," was formulated by Riot Games in February of the same year.
On November 3, 2018, Soyeon and Miyeon collaborated with American artists Jaira Burns and Madison Beer to perform "Pop/Stars" at the 2018 League of Legends World Championship. On August 8, 2018, it was announced that Soyeon will participate in a girl-group collaboration project called Station Young for SM Station's X 0 alongside Red Velvet's Seulgi, Kim Chung-ha and GFriend's SinB. On January 11, 2018, it was announced that Soyeon would be re-debuting in Cube Entertainment's new girl group called (G)I-DLE as the group's leader and main rapper. It was speculated that Cube Entertainment already had plans of (G)I-DLE at this time, hence the title of the second single. She officially debuted as a solo-singer on Novemwith the digital singles "Jelly" and "Idle Song". On December 29, 2016, Soyeon signed an exclusive contract as an artist under Cube Entertainment. She also gained three tracks on the show's final compilation album. The show finished with Soyeon as 2nd runner-up. In July 2016, Soyeon appeared as a contestant in the third season of the rap competition show, Unpretty Rapstar. However she ranked at number 20 on the last episode and failed to become a member of the winning girl group, I.O.I.
She remained a popular contestant throughout the show, peaking at 10th place on the 5th episode. In January 2016, Soyeon appeared as a representative trainee for Cube Entertainment on the first episode of the girl group survival show, Produce 101. The audition period in Seoul was over, so she went to Incheon to audition and became a trainee. She became a street dancer, but decided to audition once again after seeing Cube Entertainment's 2014 audition poster. As a result, she let go of her dream of becoming a singer and decided to pick up dancing again. She did not accept any of the offers because their directions in music were different from hers. She gathered the courage to rap at auditions, which earned her calls from several places. She felt that she needed a new change and came to the path of rapping. She went 20-30 auditions when she was in elementary school without anyone knowing. She entered and won numerous ballet competitions in her 3rd year of elementary school, but decided to quit ballet to pursue a music career after seeing Big Bang perform. She entered Kuryong Elementary School and started studying ballet. For period of time, she made sure to carry with her ninja weapons that sold from the stationary store. She also enjoyed watching anime, and dreamed of becoming a ninja and a pirate after watching Naruto and One Piece. At home, she enjoyed dancing and singing, which became a foundation for her music career. When she was still a toddler, she couldn't fit in at the daycare, so she ended up being homeschooled. Soyeon was born on Augat Samsun hospital.