It's supposed to be ironic. For a man that has lived in luxury and had never ONCE been sick dies from a cold, the same cold/weather that was what beom feared would hurt him a year prior, it's poetic. Something that they thought would never hurt him, not when compared to the prince, the assassin's, and his missions. It's ironic
Geum-hoo was still on the run for being a suspected murderer. He had lost everything the moment he was taken into custody which is why all the people from the butchers' village were shielding them as they ran from the authorities.
Seun-woo or whatever was able to get the bastard prince sentenced, but that didn't absolve Geum-hoo of his suspected crimes since they didn't have proof that he wasn't the one who had his cousins murdered.
Geum-hoo couldn't walk. Beom's job that day was to help reconstruct a bridge that had fallen and he had hoped to finish the job before the day ended. He stayed longer specifically to steal more food to take back to Geum-hoo 'cause they had both gone without eating for a while. Beom didn't expect Geum-hoo to sit outside and wait on him out in the cold or he would have rushed back immediately.
Eun-hoo and the others were literally on a different continent and had no way of knowing what was going on in Korea at the time. It would have been a lil too unbelievable for them to swoop in at the last minute to save the two from starvation and illness. Not to mention Beom constantly had them moving around so there was no telling where they had ended up.
The ending was good. It was poetic and gave them a chance to live in another lifetime happily and in peace. You just don't like it 'cause it was too realistic and you're too used to things just conveniently working out for the protagonists so they get to live.
Lucky, there's always the 'reincarnation' plot if things doesn't work well with the past timeline, and for story development. Too realistic to die with a cold, yep. Also, I am not too used to things just conveniently working out. I've read a lot of stories with almost all of characters dying, for a better plot or even for a justifiable ending. That's why I say that with this one, I don't take it well, cause compared with other stories that is more dramatic and psychological than this, there is seriously still a chance for them in their current lifetime instead of the 'reincarnation' plot twist.
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Somehow, the ending for Geum-hoo seems unnecessary. Why can't he just get back to his estate then? Why the unnecessary suffering? Why couldn't Beom just take him to work with him then, instead of living him alone and vulnerable? It's like malnutrition is the main cause of it. If he was properly attended with his needs, that wouldn't happen at all. I was secretly hoping for Eun-hoo with Sullivan and Muhu to apppear out of nowhere to help them, seriously. So, I can't take the drama at the end well cause it could have been better, there's a lot of other choices open.