Takebacker's Ultimate Brawler Guide

Well i would think a skill like that would add the stated percentage to each hit (if the skill hits more than once) even if it wasn't explicitly stated, but still even with 3 hit corkscrew it wasn't per hit. :/ I didn't notice much increase in DU but i'll mess with SP resets a bit when i get on.

I still just fundamentally don't believe in Double Upper. It is two times slower than Flash Fist, but is not two times stronger. Might as well have had Improved Infighting add some Flash Fist and Somersault Kick damage too since they care about it that much.

Anyways, the description in question.
백스핀 블로우의 데미지 +100%, 더블 어퍼의 방 당 데미지 +70%, 스크류 펀치의 데미지 +120%
Backspin Blow Damage +100%, Double Upper Damage (Per Hit?) +70%, Corkscrew Blow Damage +120%

Google Translate gives "per room", 방 itself has the meaning of Room, but among other nouns, shots comes up.