Park Se Yoon (born October 16, 1989, Seoul), professionally known as Crucial Star, is South Korean rapper and debuted with a nine track mini-album, titled “A Star Goes Up“. The album features big named artists like Basick, Dok2, Kebee, The Quiett, and many more. Crucial Star segued into the hip-hop music scene at the age of 17, performed in a group titled “Libra Twins“, and eventually tried out (and won) to become the first open-audition musician to land a deal with the Korean hip-hop label, Soul Company.