This is the 16154th most frequent Korean word.
불법이나
"불법이나" means "illegal or unlawful."
In this context, '불법이나' is used to indicate that parking is illegal, but introduces a contrasting circumstance: people still park here despite knowing it is prohibited.
이곳에서 주차를 하면 불법이나, 차가 많아 사람들이 사용합니다.
Parking here is illegal, but many people use it because there are many cars.
Here, '불법이나' describes the illegality of the product, with further clarification of the underlying reason for its prohibition.
그 상품은 불법이나 위험물질이 함유되었기 때문에 판매가 금지되었습니다.
That product was prohibited as it contains illegal and hazardous materials.
In this usage, '불법이나' is part of a phrase indicating both illegal and irregular actions, collectively impacting societal norms.