Kaiser is the leader of the Black Forest Sect. His main objective is to oppose the Murim world and its laws. He is seen playing around and using Han Chun-Woo. As such, he should be in a very powerful position. He is often shown to speak German. Given that Kaiser is the one who started the conflict over the separation of Murim and normal society by leading the Black Forest Sect, he can be considered the true main antagonist of the series.
(Source: The Breaker Wiki)
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