exo loyal fan

on episode 11 now. it took me 2 years to watch this because im not sure i can handle watching such a loooooooong drama (each episode is 1hour and half long not to mention they have 20 episodes here

can someone please explain why jidwi has to marry princess sookmyung? i thought they were something like a half siblings?!??? i just dont understand. and yes ahro's character is very irritating in the last 2 episodes, she keeps on crying and that is quite annoying