a dissolute or idle young person who avoids work and wastes money or resources

To have a change of heart or reform one's ways.

gold; the chemical element Au; specifically 金子 jīn​zi or 黄金 huáng​jīn

Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings

to exchange; to trade; to switch; to convert currency