
Everything is understandable. Lee Sooha was mentally unstable from the beginning. I mean, who would stay with a dead corpse for an entire week, trying to starve themselves? Only someone who's mad would do that. Being crazy and seeking love, attention, and affection made things worse for him, in my opinion, given his personality. Despite Haewon giving him physical care at the beginning, after discovering his feelings for Sooha, Haewon did a lot of things he despised just to keep Sooha with him. He didn't feel the need to let Sooha know, which is logical. Who would tell their partner, 'I'm doing this and that just for you, so shut up and be thankful'? That would be a burden to his partner as well.
This was the biggest misunderstanding, leading to all the consequences that followed. When Sooha felt betrayed and deceived—which he wasn't, but for a mentally unstable person, it was the perfect reason to do what he did. So everything is understandable, and the story plot was well-written.
I also didn't like his mom. She was the cause of everything. Despite knowing Haewon wasn't her blood-related brother, meaning Sooha wasn't his nephew, she should have let go of the matter and let Haewon take Sooha from the beginning. She just ruined her son's life with her own hands.

Should I read "King maker's" (Shounan Ai) first an then read the mature version, or can I just skip the first story????

No, you have to read the first one. The mature version is only for the later seasons called Triple crown, that tells the story when they are older. If you start with triple crown, you won't understand wtf is going on. So first read the Kings Maker and as you go to triple crown you can read the mature version. But the non R18 version is complete so it will take a really long time for mature version to catch up and finish

So, he's more like a chicken laying an egg by Bluetooth instead of having a baby human, just like an egg-laying animal but a human. -__- This story really has no meaning.
I know the author— all of his "Seme" characters must be caring and nice to their partners from the beginning, but this one was beyond normal. Seram suffered a lot because of Theo. At least make him have some animosity towards his enemy, then make him fall for him, not at first sight.
Brothers Without Tomorrow!! Just WHY?? :''(((( I really like your work, but not this one. Regardless, I don't hate it that much, but I don't love it like your other works. :''''(((((
(╬ ̄皿 ̄)))

That was so fucking good, recently I've been just reading crap after crap, so this was such a delight to read. Pil-gyun you're just a tyrant demon disguised as an angel in Nanmu's eyes and ours, but I didn't hate at all, I loved it ,baby angel!! their relationship is just mesmerizing and adorable.
Brothers without tomorrow you've never disappointed any of your readers, EVER!, you're just a masterpiece of genuis. THANK YOU
The story was so adorable and lovely, I loved it ٩(๑❛ᴗ❛๑)۶