
Me : "...a BL with a concept of moving on, acceptance, and dealing with the past? Also I would like side characters which purpose not only to serve as catalysts for MC's relationship, please?"
Author : "Lol you're looking for wrong manhwa."

SPOILERS for anyone who didn't finish "Hate Mate":
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The story ends in ch. 43 with Subin having moved on with Jun, them getting couple rings and Subin saying "I love you", and then Subin and Hyunwoo meeting as just friends and it ends the way you were asking for - moving on, acceptance,...
But then, in the extras we see that Subin and Jun keep fighting, Subin moves out and they are together only because neither of them wants to break up. Jun tries to make it work by buying an apartment and asking Subin to move in with him. Hyunwoo realizes he likes Subin, so he decides to leave. So, on the day of the house-warming, Hyunwoo says good bye to Subin and tries to kiss him. Subin doesn't even try to stop him but Jun does and Hyunwoo leaves the country that day.
It ends with Jun and Subin still together but Jun feeling insecure as though he is just waiting for them to break up, and Subin irritated with Jun but hanging in there.
It's a more realistic ending like most married couples go through, but it made me feel like maybe it'd be better for everyone involved if Subin just dumps Jun and goes back to Hyunwoo. So yeah, avoid the extras if you want your kind of story.

Because you said don't read the extras, I skipped straight to the end of the story to see why ; but I must say I like the extras. Not all rainbow and flowers. One of the most realistic portrayal of relationships I've seen in BL. Even if Subin and Hyunwoo went back together, I think they would feel satisfied just for a moment, then they would realize why they broke up the first time. The circle repeats.
Thank you for recommending. I will read the whole story later!

Oh well. I've read many things, hahaha. I love sappy romance stories, but stories that depicted flaws in a relationship, and the main characters are aware of their faults, are enjoyable too. Each to their own taste!
Oh and do you have manga/manhwa recommendation where the couple already settled and trying to overcome crisis in their relationship?

http://www.mangago.zone/read-manga/kazoku_ni_narouyo/ - Not really crisis but a gay couple who have to take in their friend's child and adjust their lives to revolve around the child
http://www.mangago.zone/read-manga/netsuai_nante_ariemasen/ - again, not much of a crisis but dealing with stuff that happen after getting together
1. Has "pervert" on the title
2. Main characters are perverts and they both acknowledge their kinks
3. I'm a pervert.