This took me a while to get after using this character for arcade mode and survival I thought I would try out his combo's and got this method.
From the main menu head into Practice mode -
Select Hwoarang as your character and pick anybody else for your partner and opponent -
Now once your in the practice mode you have 3 options to pick from -
Press
,
,
,
,
, This attack will be a 5 combo and a 72 damage move.
Press
,
,
,
, This attack will be a 4 combo and 62 damage move.
Press
,
,
,
Then as your opponent is in the air quickly press
,
,
,
, This attack will be an 8 combo and 97 damage move.
Try them out see what works best for you either of the 3 you will get the trophy I thought I would list multiple for people that may find it hard.