Kim received international attention for the precision of her computer mouse movements; following an incident in 2016 in which other professional players accused her of using aim assist software, she proved her ability in a monitored studio and was signed to EHOME Spear, a professional team that ultimately disbanded without participation in the first-division APEX tournament.

After a short stint with ROX Orcas, she signed with the Dragons in 2018 to become the first female player of the Overwatch League and was later named one of Time's 2019 "Next Generation Leaders."

[2] Sometime during this period, Kim was ranked on Overwatch as one of the top Zarya players[3] and developed a reputation for her shooting and win ratio.

Kim livestreamed proof of her ability from a Korean eSports website's monitored studio, and both players quit, although one of them returned to the competitive scene under a new username.

Though the team was not a strong performer in prior series, ESPN wrote that its new lineup was an improvement, and Kim's signing was a new height for her career, as she was expected to become Overwatch's first female professional player.