Wait i have theories. What if that hyung is vael and the secret he keeps is that he knows who he is and what happened. It's not a spoiler is just theories and i want to hear more theories about this manhwa. But still i love this manhwa
Comment by Anime fan on Navi's Comedy of Romantic Errors - Chapter 62
2 Replies
@Anime fan my theory is quite similar but I think the hyung reincarnated (maybe at the same time, but i think wayyy earlier than mc) as vael w/o knowing about navi, hence why he "grew closer" rather than already having a prior attachment. 
-- would b cute since that could also means he feel for him twice 
@Anime fan I also think vael is the hyung but i don't he knows that himself cus isn't the secret he is hiding is that he have to kill mc to maintain the balance