NTS regular Yaeji has been hosting Kraeji w/ Yaeji since 5 August 2020. On 24 February 2024, Yaeji was a guest on NTS & On: Energy Theory with Yaeji; on 3 August 2022 was a guest on Soup To Nuts w/ Anu; and on 7 June 2018 was a guest on DEBONAIR. Yaeji has been played on NTS over 100 times, featured on 96 episodes and was first played on 21 April 2017.

Kathy Yaeji Lee (born August 6, 1993 in New York City, U.S.), also known as Yaeji, is a Korean-American singer/producer of electronic deep house music, with whispered vocals in Korean and English.

Yaeji was born in Flushing, Queens as a single child in a Korean family. Growing up, she moved from New York to Atlanta when she was 5, and then to South Korea in the third grade. Yaeji grew up in Seoul, South Korea, and eventually moved back to the United States to study conceptual art, East Asian studies and graphic design at Carnegie Mellon University in Pittsburgh. Yaeji embraced DJing as a hobby while attending Carnegie Mellon, after learning how to use Traktor and beginning to DJ at house parties. She DJed for two years before learning Ableton, making her own music and debuting on Carnegie Mellon's college radio station. Yaeji graduated from Carnegie Mellon in 2015.

In 2016 she released her first single New York 93. In 2017, she released her first self-titled EP, yaeji and later the same year, she released her second EP, EP2.