Well he has other stuff tacked on top of taking drugs, like buying drugs, trying to get rid of evidence, not fully cooperating with the investigation etc.
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This shouldn't come as a surprise, but a judge has denied an arrest warrant for Seungri and others related to the Burning Sun case. Also the police will be concluding the case as well. All the Korean dramas and movies about how powerful the rich are and how corrupt the system is has got nothing on what's happening in reality. I'm thoroughly disgusted by how everything's been handled, no wonder Seungri himself said that the South Korean legal system is a pile of poop, it really is.