Yeah i agree with you,i finish read in toonkor hosik story too,and i really cried so hard when hosik died in their past life,and yeah it seems that sunbae he knows their past life history and all,thats why the way he love and care hosik in this present and future are soo sweet,loving perfect husband towards hosik and baby.
Ooh there is another webtoon/manga on this site with a similar premise if you guys are interested in checking that out. It's not completed yet but similar in the way that they were lover in the past where one passed away. And now they are falling in love in the present time. It's also omegaverse and according to the raws, it Involves them having children together. It's called Keeper of the Pearl. Just wanted to put that out there if you guys were interested in reading more BL/mpeg with a similar plot
http://www.mangago.zone/read-manga/keeper_of_the_pearl/
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Their past lives broke my heart. Seriously. Maybe it's just me, but maybe the way they act right now, especially sunbae, was because of what happened in the past. I don't know how to explain it well and I can't read korean, but that's just how it looks to me lol.
Still, a lot sunbae's action made me shook my head. ┑( ̄Д  ̄)┍