[5][6] Ranking sixth place out of the nine debut spots, she went on to join the newly formed girl group Twice as one of its rappers and singers.

For the group's second Japanese studio album &Twice, on the track "How U Doin'", Chaeyoung took part in composing for the first time, making her the first member to do so.

[4] As a soloist, Chaeyoung released covers of "Alone" by Cheeze[1] and "Off My Face" by Justin Bieber as part of the Melody Project series.

[18][19] In 2020, Chaeyoung's personal phone number was leaked on social media; JYP Entertainment released a statement about the incident, and she responded directly on Twice's Instagram page.

[24][25] On March 18, 2023, Chaeyoung appeared wearing a shirt with imagery of QAnon, an American far-right conspiracy theory movement, during a promotion of "Set Me Free" on MBC's Show!

[26][27] The crop top showed a large Q in American-flag print with the words "We Go All" below it, a prominent slogan of the conspiracy theory group.

[29] The T-shirt specifically featured an image of Sid Vicious, bassist of the Sex Pistols, wearing a tilted right-facing swastika identical to the one used by Nazi Germany.