For your questions to be answered on what is going on, you have to finish it first. Those who created this drama is a genius, they have put the answers to every questions a viewers may have all throughout the drama specially at the end, but believe me, even though you would realize that you have seen the answer it will still turn out that you do not understand it, you'll just see that the enemy was killed and the misunderstanding was cleared, the main lead got their revenge and the main meads ended up together, that's it !
The catchy thing here was the 4 minutes prediction of Great , at first I thought it was a fantasy, but the first half was just I think imagination of Great to foresee what will happen after 4 minutes because on the episode 6 there was no more predictions from him that was shown, everything happens the way they should be , and it turns out that the first parts seems a hallucinations only that is being studied by the other doctor that was a friend of P'Tyme. And that the story went into something like it was showing that what really happens in the 4 minutes that the brain still working without an oxygen, maybe that was when someone is about to be brain dead, that is what I understood about this show.
About what has happened with the other characters for me nothing was special about it because I have seen so many crime and plot twists stories like that but it was still great.
The drama was a good one, not boring and you can really prove to yourself that it was a high quality show and great actors has starred , I mean look at the acting ! It was superb, binge watchable , for me this is a recommended one , looking forward for more of Bible's works he is such a fine man and actor .