Kim Na-hyun (), better known by the stage name Effie, is a hyperpop musician from South Korea. She began releasing music independently on SoundCloud in 2019, while still in high school.
Effie released her first EP, Neon Genesis, at the age of 18, after being inspired by the music of Drain Gang. Effie, and the release of this EP, have been associated with the birth of South Korea's "sad girl movement". Effie released her debut album E on March 28, 2025. The title of the album pays homage to Ecco2k's album of the same name.
In August 2025, she released the EP Pullup to Busan 4 More Hyper Summer ItâÂÂs Gonna Be a Fuckin Movie, which was met with critical acclaim. Pitchfork gave the EP a 7.6/10, saying Effie's performance "oozes personality". Jon Caramanica of the New York Times ranked the EP as the best album of 2025.