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"): High4 (hangul: 하이포; stylized as HIGH4) is a three-member South Korean boy band under the management of N.A.P Entertainment.
Relevant evidence: Yes