Kim Seo-hyeon, also known as Katie Kim or KATIE is a Korean-born American singer and the winner of the competition show K-pop Star 4. Katie was first exposed to music through school choirs and 90’s and 00’s pop radio. She attended Berkley College of Music.

In May 2018, Katie signed with AXIS, a company founded by former YG creative director SINXITY. She debuted with the single “Remember” on June 6, 2018. She was also featured in rapper, BOBBY’s album LOVE AND FALL on the song “Secret!”.

In 2019, Katie released her first extend play, titled LOG, featuring the song “Thinkin Bout You” as title track. The album is recorded in her first language, English.