noun
rags to riches; overnight millionaire
Idiomatic expression for someone who becomes wealthy very suddenly, often contrasted with 一夜乞食 (overnight beggar).
See also: 一夜乞食
彼は株で一夜大尽になった。
He became an overnight millionaire through stocks.
宝
Some people become rags-to-riches millionaires through the lottery.