Unofficialboyy (언오피셜보이) is a South Korean rapper. He debuted under Urbane Music in 2017 and was previously under multiple companies such as F.A.M.E Records and Ambition Musik. He rose to prominence after participating in multiple seasons of the rapper audition show Show Me The Money as well as High School Rapper.

He is a rapper, songwriter, producer, and a part of the Korean Hip-Hop crew D.O.G. (drugsonlinegate), comprising fellow rappers Yanghongwon, M3chvnic, Ranchia, HAIFHAIF and gamma, with whom he has founded his own record label of the same name.

His breakout album was BaddyHomieMixtape Pt.1, and has released multiple collaborative albums, such as 그물,덫,발사대기,포획 (Net, Trap, Launcher, Capture) among others.