악화가 양화를 구축한다

Etymology
Probably : the principle of, formulated in 1860. A figurative use of the phrase is common in East Asia, cf. 🇨🇬, 🇨🇬.

Proverb

 * 1)  bad money drives out good
 * 2)  people of mediocre talent, or items of mediocre value, drive out real talent or value