For my answers...
1st question: ... They never meet, but Yohan knows that Donga will forever be there with him and watch him.
2nd question: Nope.
3rd question: No, because Hades clearly said he wasn't interested in him anymore.
4th question: Hmm... that wasn't clearly stated, but it'd better be. It's not as if the Heaven need to seperate two lovers, right?
5th: I could only imagine that the emperor is trying to make Donga comfortable, afterall, he's still new to the Heaven.
6th: Well, the brothers DID say they felt kinship... and I don't think the brothers are all that cruel. Seeing how they expressed a poker face, I think they felt a sense of familiarity.
You wouldn't know what even happened while Donga and Chunho was in heaven, but... we have imaginations, right?
╮( ̄▽ ̄)╭
I cried so hard. What happens to Yohan and Donga?! Does Yohan ever receive his powers back?! Does Yohan serve Hades in the underworld?! Do Donga and Chunho get to live together?! Is Donga happily serving the emperor too?! Do Donga's brothers have a good relationship with him?! Smh so stu I cried so hard. It was a good plot but stu ending in my opinion cuz like wtf happens yk? Too many questions which I can't stand. The uploader did a good job at cropping tho so hats off to them.