The problem is, the new lover completely know that joyoon (mc) havent died yet, and still make a move to get the ex by blocking every news about mc whereabout (so the ex will believe that his lover alrdy died and accept him) So he alrdy known that his position isnt stable. And its his own karma.
Unless my memory failed me that didn't happen in the story untill now, and if it is revealed later on than this is a spoiler. If it is a spoiler then this wasn't very nice of you. There may be people who did not want to be spoiled. If it's not a spoiler then sorry for assuming it was.
Damn when the ex said he doesn't love his lover the same way he used to love the mc... That shit hurts. The ex's lover was definitely made look like a bit of an asshole, but the poor dude is in a tough spot. Knowing that you'll never be able to fill the void completely must be awful. The ex may have been an asshole to the mc, but he understands how much he is hurting his lover with this whole situation.
If the main couple was the ex and his lover, I bet the comment section would be calling the mc names for hanging so long on a past lover.
Situation is bad on all fronts, hope the author will not go back on this drama too much and allow everyone to move on.