Have Fat Mike and Shim Eun-jin collaborated on music previously?
Fat Mike: Michael John Burkett (born January 31, 1967), also known as Fat Mike, is an American musician and producer. Fat Mike:  He is the bassist and lead vocalist for the punk rock band NOFX and the bassist for the punk rock supergroup cover band Me First and the Gimme Gimmes. Shim Eun-jin: Shim Eun-jin (Korean: 심은진 ; born February 6, 1981) is a South Korean singer and actress. Shim Eun-jin:  She was a former member of 1990s girl group Baby V.O.X.
i don't know