Okay so I am still on 17 to be honest, but I wanted to write anyways.
Spoilers!!!!!!!!!!!!!!!! WATCH OUT BELOW ^_^ .............
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 So "our" theories were wrong Shin Se Gi is not the original personality. Joon Young was (though we don't know this name in relation to this show...hmm) and we still have yet to meet Mr. X.  Also we now know where Perry Park came from and why he likes boats LOL. I wonder if we are going to figure out how each personality was created.

So if Cha Do Hyun and Shin Se Gi are not the original personalitys, and if NANA had been in "sleep" mode then can any of these personalitys really manage to be the main person?

Also I have a problem with  Joon Pyo being a good dad?(At least before returning to the mansion) What changed? He even went back to save Do Hyun?

What/who caused the mysterious death of the old chairman and Joon Pyo's ex-wife? I say Joon Pyo...

This is where I am at in processing this story. Anyone have any other ideas? Im getting real eager about the end of this show

PS why do they blur out knives?