Question: When was the South Korean singer, actor, host and entertainer born who was known as Ballad Prince and was also a star of Gu Family Book?
Sentence (from "Lee Seung-gi"): He was a member of the first season of weekend variety show "1 Night 2 Days" from November 2007 to February 2012, and the host of talk show "Strong Heart" from October 2009 to April 2012.
Relevant evidence: No