i want to ask is it right they have song her name"what's up?"

cnblue dont have a song with a judul "What's Up". but from what i know what's up song is sang oleh four blondes and the song were sang oleh seohyun on wgm, while she's learning gitar from Yonghwa wh.Yonghwa asked her to practiced that song:).but cnblue dont have a song called "what's up" : )