I wouldn't be mad no matter what the outcome of the show will be. I'm almost sure that the writers will pull something incredible (but yeah, there's always this one per cent of doubt that they can also mess it up...). IF he is going to die, I can imagine that it would be something like he being in some kind of way happy with Mo Hyun, and then Boo Cheon is gonna pull his own revenge on Pil Joo. If he's not going to die... Well, I hope will also be happy with Mo Hyun. Even if it takes some years for her to forgive him. Although she can also take her time forgiving him while being together with him xD (wishful thinking, I know... >.<).