On August 2, 2015, Lee held his initially solo fan conference in Japan at the Tokyo International Forum and met with 10,000 lovers. They then fulfilled Kang Min-hyuk, also a latest fellow member of CNBLUE, at FNC Music in which they auditioned. In 2010, Lee produced his performing debut in the omnibus movie Acoustic together with fellow member Kang Min-hyuk. Korean Film Biz Zone. 김병만의 의지" (공식입장)" (in Korean).