The ending confused me as well, how did the dead gangster shows up driving Hyun Soo after he was captured? It didn't click with me the first time I watched it but the second time I watched it I was like, 'how did I miss this'? The bad guy monster, took over the gangster's body, and took HS. We can see it looks like there's a dead passenger in the front seat of the vehicle driving HS. That would explain why he doesn't have any scars anymore, and why he says ' long time no see'. But I could be wrong LOL ready for season 2!!