AB6IX's Kim Dong Hyun is proving that he has matured more than ever as he gears up for his official debut. 

Dressed in stylish fashion items ranging from vibrant yellows and purples to more toned down blacks and beige colors, Kim Dong Hyun gives off an upgraded air of maturity and professionalism from his MXM days. 

Brand New Music's first ever idol group AB6IX, made up of Kim Dong Hyun, Lim Young Min, Jeon Woong, Lee Dae Hwi, and Park Woo Jin, will be making their debut with their 1st mini album 'B: Complete' this May 22. The members are also currently greeting viewers through their Mnet reality series, 'Brand New Boys'. 

Check out Kim Dong Hyun's eye-catching teasers below.