Girl group After School's member Raina will be collaborating with rapper Kanto this time. This will be for her solo album. She had made a big hit with "A Midsummer Night's Sweetness" with San E this summer, so many are curious if she will make it big once again.

On October 8, Raina will be releasing her solo title song "I Know It's A Joke". This song is about her lover whom she had spent a midsummer night's sweetness and suddenly breaking up with him.

Thus the song will be of a different vibe from the sweet love song "A Midsummer Night's Sweetness". Raina will be singing about her heart in denial, saying that the breakup must be a joke.

Because Raina received such great results through her last duet song, expectations for her new song are even higher.