Astro Bits (also known as Astrobits, 아스트로 비츠, bk, bk!, Kim Bum Soo) is a South Korean electronic musician born 1970 (not to be confused with ballad musician Kim Bum Soo born 1979). He studied music in Japan and won Ryuichi Sakamoto's Music Audition by J-Wave in 1996.

He was part of Yoon Sang's band papermode that appeared in credits on Yoon Sang's 2nd album Part 2, but he went solo after Yoon Sang's enlistment and papermode's dissolution. In 1996 he released his solo album Guardian Angel under the name Kim Bum Soo. He released several albums under the name Astro Bits, and also participates in audio mastering under the name bk! for artists such as Park Jiyoon, Sunwoo Jung Ah, Stellar, YUKIKA, Ladies' Code, Casker and others. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.