Ok...
Do WoC until you get the quest Cleansing the Sunjang District. From there leave from Zin Cu Corridor Outpost.... Go Right.... there will be 0-1-2 chests by the time you get to the named ranger Shiro ken room (You will be able to tell when the Am's begin if you keep going further) and then you can resign and do it again. Remember WoC has normal mode and hard mode depending on what you're doing and how far along in the quest line you are. Also, make sure your quest is active