GTO and Kimi Wa Petto Actors!! WHAT?!!

I watched the trailer not really paying attention, and then was like - is that?!? Is that TAKASHI SORIMACHI playing Genghis Khan??? Hahaha ROFL
I've only seen him in roles where he's a funny guy who clowns around a lot. Was Genghis really just a soft-hearted joker? lolol, I have to see this now...wonder how long I'll have to wait.
Wonder if Sorimachi will be able to do the whole movie without one of his charismatic smiles, just glowering and looking tough.