This expression attaches to some nouns to express a type of passive form in which the action or state expressed was performed by some other subject. It is used mainly after Sino-Korean words.

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1492년 콜럼버스는 아메리카 대륙을 발견했다.

In 1492, Columbus discovered the American continent.

나는 이 노래를 사랑하는 아내를 위해 작곡했다.

I composed this song for my wife that I love.

노사 문제를 해결하려고 아침부터 노사 양측이 모여 회의를 시작했다.

Trying to solve labor and management problems, both sides met to start meetings in the morning.

When 하다 is added to some nouns, it means that the subject performs the stated action, and in such cases, the object particle 을/를 can precede the verb. However, when 되다 is added, the passive meaning is indicated, and thus the particle before the noun changes to '이/가'

정부가 낙후된 지역을 개발하겠다고 발표했다.

내년 하반기부터 낙후된 지역이 개발될 예정이다.

The following chart shows action verbs with 하다 attached and their passive counterparts with -되다 attached.

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Indicates nouns into passive verbs, things working out, becoming something.

Details

Usage

Can be attached to nouns to make a compound verb, as well as stand as a verb on its own.
Since 되다 is a passive verb, it uses 이/가.
Similar to 아/어지다 but more often used as the passive form of 하다.
Often used in grammar forms such as 아/어도.