It's taken me over 1.5 years, but I've finally discovered what I would consider a spicy Korean dish: 양푼닭갈비찜 (yangpun dalkgalbijjim). Every bite made my mouth tingle. My throat burned with every swallow. Water didn't help. I'm still feeling the effects of it almost 12 hours later-- I am breathing up fumes of the meal even now.
Good job, miscellaneous Korean chicken restaurant.