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 "High4"): They officially debuted into the Korean entertainment industry on April 8, 2014 with the song "Not Spring, Love, or Cherry Blossoms" featuring IU.
Relevant evidence: Yes