(으)리오

how could, who would

Structure
Vowel-final: 하다 → 하 + 리오? → 하리오? (how could one do it?)
Consonant-final: 먹다 → 먹 + 으리오? → 먹으리오? (who would eat?)
ㄹ-final: 살다 → 살 + 리오? → 살리오? (how could one live?)
Explanation

Kimchi Reader

Emphasize that something is impossible or unlikely by asking a rhetorical question.