She joined Palm Tree Island in January 2022 to focus on her musical career, before moving to A2Z Entertainment later that year.

In 2023, Kei participated in Mnet reality competition show Queendom Puzzle, debuting with the resulting project supergroup El7z Up in September of that year.

[7] She was a contestant for JTBC's main vocal competition Girls Spirit in 2016,[8] and was cast for a lead role in the web drama Matching!

[10] On October 26, she released a collaboration with The Solutions titled Beautiful as a part of HIGHGRND label project PLAYGRND.

[18] On January 10, 2022, it was confirmed that Kei signed with Palm Tree Island, signaling her debut as a full time musical actress.

[24] She consistently ranked in the Top 7 as the show progressed and ultimately finished in 4th place, allowing her to debut with the winning group El7z Up.