Question: The three-member South Korean boy band, High4, released in 2014 a song they collaborated with which South Korean singer, songwriter and actress who signed with LOEN Entertainment in 2007?
Sentence (from "BTL (band)"): They were scheduled to release their second title song "Gold Moon" in the like-titled mini-album on July 23, 2015, but the mini-album was only released as a promotional album in Hong Kong.
Relevant evidence: No