[3] Hwang played at the 2007 BWF World Championships in men's doubles with Lee Jae-jin.

They were seeded 10 and were defeated in the third round by Candra Wijaya and Tony Gunawan, 21–17, 21–16.

In Beijing 2008 Summer Olympics, Hwang and his partner Lee won their first bronze medal after upsetting Choong Tan Fook/Lee Wan Wah in the first round, Tadashi Ohtsuka/Keita Masuda in the quarter-final, but defeated by Cai Yun and Fu Haifeng of China in the semifinal.

Nevertheless, in the bronze medal match, Hwang and Lee subdued Danish Lars Paaske and Jonas Rasmussen.

A season of Superseries features twelve tournaments around the world, which introduced since 2011, with successful players invited to the Superseries Finals held at the year end.