John-un botong sul-e chuyhatssul-tte-man chum-ul chu-chiman, ku-uy saengilnal-enun (chum-ul) onjeonha-key chu-ess-ta.
John-nom usually alcohol-E drink-PAST-when-only dancing-acc dance-but, his-Poss birthday-on sober-KEY danced
Usually John dances only when he is drunk, but on his birthday, he danced sober (without drinking/in the state of not drunken).