when they touch something hot, they say "앗, 뜨거워"(Oh, it's hot) when they touch something cold, they say "앗, 차가워"(Oh, it's cold) when they get an electric shock or be bitten by the bug, they say " 앗, 따가워"(Oh, it's sore) 앗 is an interjection, exclamation. Somewhat like "oh, ick, oy, yeow" 뜨거워 is from "뜨겁다"(hot) + 어(informal ending suffix) 차가워 is form "차갑다"(cold) + 어(informal ending suffix) 따가워 is form "따갑다"(sting, prickle,sore) + 어(informal ending suffix) 뜨겁다, 차갑다 and 따갑다 are ㅂ irregular verbs.