Hong Chulki, musicista coreano, fonda nel 1996 i Mani Mukgo Himne. A partire da un uso rumoristico della chitarra imperniato sull'utilizzo di feedback, sviluppa un progetto assieme a Choi Joonyong, negli stessi anni in cui uscivano gli Astronoise. Comincia quindi ad utilizzare piatti, mixer, lettori minidisk rotti, e computer, sempre all'interno del campo della ricerca sui feedback amplificati. Parallelamente all'uscita del primo demo Feedback Composition No.1, realizza il lavoro in solo Lightyear. È membro degli Astronise e dei Seul Frequency Group.
Hong Chulki lives in Seoul, South Korea. In 1996 he formed the band Mani Mukgo Himne. Into guitar noise and feedback, he brought up the idea of forming a noise project with Choi Joonyong. In the early days of Astronoise, Chulki played guitar making only howling feedback sound. Now he uses turntables, mixers, broken MD players, laptop, CD players. Still, it's all about feedback and amplification. When Astronoise's first demo tape Feedback Composition No.1 came out, he also released Lightyear, his solo guitar soundscapes. He has also led bands including Puredigitalsilence and Automatic Hand-dryer. He currently performs as a member of Astronoise, Seoul Frequency Group as well as solo. He has released three solo albums (including one web release).