Please do one of the following.

Code	Effect
Highlight Dong Hwan, hold Start and input the following code: Up, Up, Down, Down, Up, Down.	Play as Grant: Continue holding Start, press any button to confirm selection.
Highlight Jae Hoon, hold Start and input the following code: Down, Down, Up, Up, Down, Up.	Play as Kain: While still holding Start, press any button to confirm your selection.
Simply hold START and press any button.	Random character select