Dont worry it updated now in lezhin..
I feel the same way, that ending was bullshit and so forced...
Jiwook will not repent. He can't. His victim streak is way too strong. He was completely *fine* with the fact the his brother tried to kill himself for months, he's not going to suddenly wake up and feel bad now. Depending on the shitstorm he's about to go through with Joohoon, he'll whine more or less when he gets home but probably wont look Siwon/Taemin in the eyes again until one of them moves out. Doubt there will be a repair - Jiwook reads as 95% hopeless to me.
As for hearing the name "Taemin" - didn't even register for him, why would it? What actually happened was an impossible, supernatural event so it's off his radar - he'll never suspect it. As far as he knows, it could be a pet name between Siwon and Siwoon.
The story can't just be over. What about the brother? We don't get to know if he truly repents. Will he begin to feel remorse and attempt to mend the relationship far broken? Will he still somehow be an ass to him? What about the other dude, what does he do with the brother next? How will the relationship between the brothers be from now on? Will the brother ever mention the fact that siwoon referred to siwon as taemin and think about how he said his brother killed himself and consider that the man before him may not actually be his brother? What would happen to him psychologically if he came to this conclusion? Much more, if taemin confirmed it? How would this further change their relationship? Also, what's to become of the other two side characters that supposedly like each other? The main characters relationship just started shouldn't it be more developed before the series ends? I know there will be extras but shouldn't what's above the side character stuff be resolved in the official series.? idk I got kinda angry that it just ended like that but I mean in the end it probably doesn't matter.