How to bug CC4 quest for 2nd role?

I heard that there is a way to bug CC4 quest over and over again to gain exp and lvl up fast, it works the same like GK quest bug or we have to use something like 9Disciple?

[9Dragons US]

Lol dunno exist a hack for 9DUS

I know the ques name and how to do... but need something more =)

Big Blue Sword Quest
Its something like it... start the quest and when u get u GK/EXP go to Select character... and rest i duno lol

[edit] doesnt mater, i choosed 2nd role now

any pro can check this up it would be very useful