The former police officer interviewed for the article believes budgetary constraints are stopping a crackdown on prostitution in South Korea; I think it is more like a lack of will of wanting to crackdown hard on it:

Prostitution is illegal in Korea. The country’s ban on the sex trade was introduced in March 2004 and went into effect later that year.
Korea Times
Despite nearly two decades of law enforcement, the nation still has brothels and red-light districts operating at night in almost all big cities and provinces, albeit at a somewhat diminished scale.
Before the introduction of the Special Law on Sex Trade in 2004, there were 35 red-light districts nationwide, according to figures compiled by the Ministry of Gender Equality and Family. The number declined to 15 in 2021. Gyeonggi Province has four, Seoul, Busan and other provincial cities have at least one or two each. About 900 women are involved in prostitution for a living in those areas, according to ministry data, although a far larger number of people are believed to be part of that profession in other parts of the country that operate under the radar of law enforcement.
Kim Kang-ja, a retired police officer best known for her role behind the crackdown of a major red-light district in Seoul when she was head of Jongam Police Station in the early 2000s, said the remaining red-light districts are a chilling reminder of a policy failure driven by budgetary constraints.
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