The easiest way to get less riot police at the THAAD site is for the protesters to assemble and protest in an area that is not blocking a public road that leads to the THAAD site:
A human rights committee under the National Police Agency (NPA) has recommended the law enforcement authorities to reduce the number of riot police deployed to a U.S. Terminal High Altitude Area Defense (THAAD) missile base in the southeastern county of Seongju, North Gyeongsang Province.
Korea Times
“As the current number of riot police there can lead to a violation of the protesters’ freedom of assembly and demonstration, the authorities should actively take necessary measures,” the committee said during a regular meeting held late September.
The NPA committee consists of 13 members ― 12 external members and one police officer from the audit and inspection division.
The committee further asked the authorities to submit additional data, based on which it can judge whether the police are guaranteeing the protesters’ freedom of assembly and demonstration.
You can read more at the link.
What will be interesting to see is if there is a coronavirus spike will the Moon administration blame the conservatives or the KCTU?:
Seoul police said Friday they will sternly respond to any illegal activities during rallies scheduled for this weekend amid rising concerns over possible spread of the new coronavirus.
The Korean Confederation of Trade Unions (KCTU) and its affiliate groups plan to organize gatherings across 30 locations in Seoul, including the wards of Yeongdeungpo, Mapo and Seocho, on Saturday afternoon, the Seoul Metropolitan Police Agency said.
KCTU will also stage a separate demonstration at Yeouido Park in central Seoul.
Regular weekly anti-government rallies by conservative groups are also scheduled to be held in Seoul’s central ward of Jongno and Seocho Ward in Seoul’s southern area on Saturday afternoon.
According to police, a total of 78 outdoor rallies were scheduled to be held Saturday.
Yonhap
You can read more at the link, but the government lifted its bans on rallies and groups can organize with 100 people or less.
I have always said that the Korean police can remove these protesters any time they wanted, the ROK government just chooses not to until recently:
The defense ministry on Thursday brought non-weapon materials and construction equipment onto a Terminal High Altitude Area Defense (THAAD) base in central South Korea after riot police dispersed protesters opposed to the deployment of the American anti-missile defense system.
The shipments transported into the base for the THAAD system in the central town of Seongju, about 300 kilometers southeast of Seoul, included daily necessities for base troops and construction equipment and materials to be used to improve their living facilities, according to the ministry.
Their transportation was completed after riot police dispersed about 70 Seongju residents and civic activists, who had occupied a small bridge leading to the THAAD base from early morning to block any vehicles from approaching the military facility.
The protesters tied themselves up into ladder-like structures installed on the bridge to resist the police and shouted various slogans against THAAD.
Yonhap
You can read more at the link.
