Seme doesn't value Uke and is in a meaningless fuc buddies relationship with him until uke can't handle it anymore and runs away, seme tracks uke down and asks him to date him but uke is not into it.
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Runaway Arch
Reencounter/ Fuck buddies / dumper's regret
Seme starts dating uke to win a bet but begins to fall while uke is in love with his childhood best friend (who is married to seme's sister).
(No runaway or regret yet but was promised good things from raws- update: it was alright)
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Bet/ unrequited love
After the death of his little brother yoohan swears revenge but while in the in between of denial and anger he has a one night stand with Jay and after crying his way through wearing a bunny mask he pays Jay and leaves. This sparks a burning pit of rage in Jay that causes him to hunt Yoohan down for years to get revenge on the man who made his heart beat for the first time in his life.
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Showbizzzz baby
runaway arch/ trauma/ Cheabol x Actor/ revenge
Seme has DID while one personality is in love with the uke the other dislikes him as he reminds him of a traumatic memory. Uke disappears after an argument and causes a lot of stress on the personality who loves him and their rekindling sparks regret in the personalities who doesn't.
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runaway Arch (minor)
DID/ mental health/ polyamory
OMG! A runaway arch! Sorry no toxicity here I support this couple but they just entered into a runaway arch so here they are.
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Reincarnation
Mates/ Runaway arch / bratty seme
Poor uke meets rich seme they date for a few years uke gets pregnant seme is stupid and breaks up with him. Uke disappears off the face of the earth and seme goes into 'missing your mate toxic shock'. The two meet back up and seme meets his daughter and does a whole lotta begging.
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Omegaverse
Past lovers/ runaway arch / ran away pregnant/ doesn't know the baby's his / dumper's regret
Read at your own risk ends on a cliffhanger (As it is on indefinite Hiatus). Hitman mercenary meets the man he's supposed to kill a very powerful Alpha mob boss the two do the do and mercenary runs away pregnant with his child.
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Mafia
Mpreg/ omegaverse/ runaway arch / extra points ran away with his baby
Protag is deeply traumatized after a event and gets two traumatized fuck buddies instead of therapy. Runaway arch happens in the last 10 or so chapters and it's honestly kinda triggering and fucked up but it does qualify as it brings the Protags boyfriends together into a fully poly ship.
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Psychological
Trauma/ polyamory/ Depression runaway arch
Alpha prince of a noble family is in love with his beta friend. Beta was separated from the Alpha when the two were childhood friends but the Alpha tracked the beta down and brought him back home. Beta runs away as a teenager to be trained and return to the place as a servant. (Runaway arch is a precursor to the story- so the love interest skipped right to the clingy don't leave stage).
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Omegaverse
Royalty/ prince x butler / Alpha x Beta / runaway arch
Desperate for cash Hakyung agrees to impersonate his dead childhood friend to fool the girl's grandmother's old friend who's son-in-law wants to impress to get in the will. While pretending to be her he meets the grandson who knows Hakyung isn't who he says but goes along with it because he likes him. Seven years later the two meet again and the grandson has lost his memories and needs Hakyung to remember again.
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Drama
debt / dynamic protag / runaway arch
A Fine Line