Which Korean dishes are typically hottest?
I found ojingeo bokkeum (오징어볶음), which is squid stir-fried in a chilli sauce, to be pretty intense, especially as a jeongol (전골) or stew, where it's both hot (as in spicy) and hot (as in temperature). The sweetness of the stew does nothing to lessen the intensity of the dish.

Also ridiculously spicy is buldak (불닭), which is again a stir-fry of chicken in a chilli sauce, with tteok (떡) or rice cake.