Even though a man is still singing..

Lee Chaerin, the popular leader of the girl group 2NE1, was once in a relationship with Big Bang's Kwon Jiyong.

They committed theirselves to a "first time relationship" so they were still artless of the things they need to do and know. They broke up after 6 months because of their own depthless discords, leaving Jiyong baffled by the way things turned out. He then realizes that Chaerin was someone who perfectly fills both his needs and wants so he pursues her again.