
Good catch with the ML’s brother. It felt like a filler since the author didn’t go on with that, seeing the brother. I think the author rushed.
I don’t think a big drama would ensue from that jealousy and dump plan. MC is the type to feel guilty and think, well it’s my fault he’s this way since I hurt him in the past (literally when they were just kids lmfao).
But just a bit of drama and kiss make up. I do think that MC should know about that revenge plan, and give him a smack.

I also feel like MC and ML should have discussed that “I possibly slept with someone else but I won’t tell ML” (MC) more.
I don’t like the: (ML) Oh you didn’t sleep with someone else? Okay good, anyways.
I mean it’s not the worst and glad that was cleared up, but I was expecting a bit more like: I left you because I saw a hickey on your neck, you didn’t tell me anything, etc. Why didn’t you just tell me this before if you didn’t sleep with someone else, what’s the hickey, etc.
I wish MC told him about thinking he possibly slept with that other guy, and that he found out he didn’t since that other guy cleared it out. All of that, should’ve been discussed.
But is it too much to ask for this?

You're absolutely right! That's a detail that would have left anyone wondering. Like "ok you didn't cheat but what was that hickey?" The author might have not realized that, although it was clarified to us - the all seeing readers - it was not clarified to Taewoong. As the other comment said, it feels rushed so that's one of the conversations that they should have had but seems to have been left out.
This is not as bad as some people made it out to be but the loose ends are annoying tbh. I major in literature and some scholars say that adding plot points that add nothing and lead nowhere is a sign of bad writing. I agree with them. These are the loose ends that stood out the most to me:
- Taewoong wanted to dump Dojin
Did the author just forget that Taewoong wanted to dump Dojin? Instead it seems like he forgave Dojin after he mumbled the truth about the fake confession while half-conscious. This was quite the unsatisfying conclusion, and then near the end of the story Taewoong is bothered by the fake confession again. It's like the author had a change of plans halfway through and decided that, for fairness, Dojin should be the one with regrets and not Taewoong.
- Taewoong's brother
Another thing, Taewoong's brother was mentioned when he brought him clothes in one of the chapters. Dojin wants to meet his lover's brother but Taewoong gets embarrassed and says they'll meet later. This seemed like a foreshadowing indicating that the brother would appear later and be quote relevant, but then he never appeared and was never mentioned again either.
To be honest, I thought his brother was gonna end up being the guy that asked if he wasn't falling in love for real, which would explain why Taewoong didn't want them to meet. At some point the supposed brother would accidentally reveal Taewoong's dumping plan to Dojin and drama would ensue.
If done right, that would mean wrapping 2 loose ends at once, and both characters would feel regretful and beg for each other's forgiveness by the end. I like this idea better, but there's no use focusing on what ifs. Oh well...