Ah this one ^///^
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SPOILERS!
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There this moment where Kim Dok-Ja becomes a demon king because of the said 'fate' that the Olympus forced onto him (btw, the 'fate' is about Kim Dok-Ja's death done by his beloved one >//<). Originally, Kim Dok-Ja has the attribute to resurrect if he died, but due to the forced fate and the weapon that Jonghyuk used to stab Kim Dok-Ja has the most effective effect on opposing the attribute and eventually, killing Kim Dok-Ja by his hands. So, basically, Jonghyuk is Kim-Dokja's beloved one. Btw, that chapter(s) are one of the most sad moments in ORV. Tho, there's some tension between Dokja and Jonghyuk. :>>
Folks, I just want to share that this day, I just finished the whole LN of ORV and I can't stop crying. I just keep remembering all the things happen to the 'group', all their struggles, pains, and the scars they attained from it. All the good times and funny moments, whoa, I really recommend you guys to really read the LN. Btw, this part of the webtoon is on Chapter 11 in LN.
P.s. I can give spoilers if you want :))