This is the 5534th most frequent Korean word.
모인
"모인" means "gathered" or "assembled."
Here, '모인' describes money that has been accumulated or collected, emphasizing the noun it modifies.
모인 돈을 잘 관리해야 한다.
The collected money needs to be managed well.
In this sentence, '모인' is used to describe an event in past tense where friends gathered.
어젯밤 친구들이 모인 생각에 웃음이 났다.
I smiled at the thought of friends gathering last night.
The word '모인' refers to the state of people having gathered, as the past participle form in the sentence.