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People here really think that if you just you the "right thing" things will work out. When that is literally not how anything works in the real world. You have to make hard choices and you change your strategy according to how the current situation is. When you are at a constant threat of being invaded, It is either kill or be killed. There is no right or wrong in that situation. Expansionist is someone who conquers other territories even if they don't pose a threat and will not stop at that. Protecting your kingdom is not eXpANSionisT.
Also, it is very much possible that soo won is not considering Yona because he doesn't want her to bogged down under the weight of the throne where you are faced with a constant threat to life. I won't say I agree with this choices, but I understand them. You can be morally wrong, but still do the right thing for the greater good.
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I also don't understand why people are complaining about soo won acting weak and second guessing his plans. I think it is very realistic. His death is getting closer and closer, you can't expect him to behave in the same way as when he was considerable healthy and still has time. When you've lived your whole life working towards something but then your time keeps getting shorter and shorter to fulfill it, of course you'll become desperate and start looking for alternatives. If you expect a character to stay one dimensional and not change according the situation they are in, then you are expecting a terrible character.
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IL was a king incompetent, superstitious and sneaky.The worst things you can be as a king. "Let's leave it to the gods while everything goes to hell". A king like that deserves to be dead.TBH I don't understand people hating on sowoon being all "holier than thou" like they would never have avenged their loved one being brutally murdered even if he was played lmao.So woon is an extremely realistic character for the setting."So woon is a psychopath" Imagine the pressure and burden on a child for them to have to examine their fathers corpse.Of course he is already planning and plotting.
and p.s Yona isn't hell bent on revenge because it is a shoujo manga and she is heroine. Of course she is kind and forgiving :P
That avalokiteshvara tattoo omg do hawt