After withdrawing from the music scene for four years, veteran ballad group '015B' has announced their return with a new mini-abum, "Twentieth Century Boy". The legends have teamed up with the ladies of 4minute and B2ST's Junhyung for their title track, "Silly Boy". For those of you who may not be familiar with the group, 015B debuted in 1990 and is known for a string of hits and collaborations between other well-known artists. By working with these top idols, the group seeks deliver a trendy twist to their classical style. "Silly Boy" is a response song to their 1993 hit, "The Love of Neoanthropinae", from their fourth album, "The Fourth Movement". Check out the teaser below! The full mini-album will be released on June 22nd. Tip: Threesixy