Videos(recorded by comrade Lee Ki-cheol), following almost the entire route of the protest, you can watch here:

1. The beginning @Jogye-sa(temple)...

 

2. Jonggak Stn/Samsung Tower --> Kyobo B/D

 

3. Kyobo --> City Hall Plaza

 

4. City Hall --> Daehanmun

 

Related reports in Korean you'll get here(by Progressive Labor News) and here(by Daily Labor News).

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