So Doctor Sin has been unveiled as the ultimate villain of "Bad and Crazy" who was once Yoon-ho, Inspector Ryoo's childhood friend with which the troubled kid made a murderous deal. "Bad and Crazy" kind of but doesn't really leave the door open to the theory I proposed in my last review, that Yoon-ho is actually yet another split personality of Inspector Ryoo. We know this has to be wrong, because Doctor Sin's devious plan involves making this as a false claim, Bad and Crazy, Cha Hak-yeon, Han Ji-eun, Kang Ae-shim, Kim Dae-gon, Kim Sae-bom, Lee Dong-wook, Wi Ha-joon, Yoo Seon-dong