If you search "Korea" on AP archive, you will find a lot of different protests. I don't know if anyone here would be interested in seeing this kind of video. But here are some footage examples I picked out along with their (abridged) AP descriptions, although there are many more.

(2000) About 20-thousand South Korean workers gathered in the capital, Seoul, for a demonstration organised by the Korean Confederation of Trade Unions. The union opposes plans for economic restructuring*, designed to alleviate the country's financial crisis. [...] And on Sunday their anger showed as they clashed with riot police during the march. The police, in turn, staged baton charges and smashed the windscreen of a labour union truck. Video

(* See: South Korea and the IMF, 1997 Asian Financial Crisis, S. Korean economy in the 90's)

(1996) Angry farmers and student activists have held a rally outside a United States military base north of Seoul. [...] Grafitti saying "Yankee Go Home" was spray-painted on the parking lot in front of Camp Casey, a U-S military base north of Seoul. [...] The angry farmers brought in tractors to try to break the riot police barricade. Video

(1996) South Korean riot police have twice raided a university campus in Seoul to break up an illegal student rally in support of reunification with North Korea. The first South Korean police raid began Thursday with a dozen helicopters pouring down yellow teargas over seven thousand militant students at Seoul's Yonsei University. [...] At least five-thousand police were involved in Thursday's dawn raid. Before marching onto the campus, they broadcast a warning against the pro-unification rally through loudspeakers. The students put up resistance by building barricades out of bins, desks and chairs and setting them on fire. [...] The Seoul government sees the students' activity as pro-North Korean because they support a North Korean demand for the withdrawal of 37-thousand US troops stationed in South Korea under a mutual defence treaty. Students claim that the US military presence hinders Korean unification. Video

(1996) Police storm university. Thousands of South Korean riot police, backed by helicopters and firing stun grenades and tear gas, stormed a university campus and arrested 2,500 students. The attack at dawn ended a violent week-long stand-off at Yonsei University in Seoul. Video

(1995) Students demanding the immediate arrest of former president Chun Doo-hwan clashed violently with riot police outside Seoul's Yonsei University. Tear gas was fired by the police. They said some 500 students poured out of a main gate of the campus trying to march on the suburban residence of Chun [...] Protestors outside house of former president Chun Doo-hwan. Students attempt to push their way past security guard into Chun's house. Video

I hope the videos above have been informative to anyone here wanting to learn more about South Korea.