On June 18, Lee Jung talked about a past experience he had with his girlfriend on MBC's 'Radio Star.'

He said, "There was a time a girlfriend in the past cheated on me. �Not to mention, [she cheated on me with] my friend. �That's why I let my girlfriend go, but my feelings would still not calm down. �I was angry and such."

SEE ALSO: SPOILER K-netizens react to the ending of 'Queen of Tears'

Kim Gu Ra brought up Lee Jung's past song "Fever." �"It's true that the story was put into the song 'Fever,'" admitted Lee Jung. �

Check out a past performance of "Fever" featuring�Tablo below!