Yaoi/ shounen ai / BL Isekai

Boy transmigrating into different world to break bad end couple and help the ML find his true love (him).

COMPLETE.
Each arc could be standalone as MC personality change to its host's. A "How to make him gay" accelerated course. It's like watching a fast forwarded drama. It's sometimes so rush I find it hilarious at its own detriment. Corny, cliché, plot holes, etc... but for some reason I got attached to it. It's not good but I still love it? Why? xD

Transmigrated 2nd time in same world but now, Maou stick to him claiming a promised marriage. Who's Maou real identity? And who brought him back?

Multiple couple. 1st isekai had lots of sad events for them all . Usual possessive but extremely devoted ML. Smart(?) MC, OP during past. "The sticky and the ruffled" relationship.
Ended up pretty cliché but readable for a Chinese manga (i'd be satisfied as long as it is healthy relationships for Chinese manga XD )

After his whole clan slaughtering, Nine tail fox demon king rewinded 2 years prior and became a human master. Needing his hidden power, he does everything to gain his apprentice trust.

Seductive playful (shameless) master X Tsundere (Upright) apprentice. MC hids as a human. ML is a Nuwa ore, as long as he willingly want to sacrifice his life for you, it can grant any wish for you. Lots of humour, some skinship, bits of drama. I'd say this is more soft yaoi than shounen ai.

Otaku ascended. To become immortal, has a last task to complete or disappear. Turns out, he has to save a psycho who kept killing him in the 1st world?!

Mc travel various worlds to help the same man who has different psychological issue each time. The die and retry tragedy is in the past (though Mc does have some trauma).
At 1st, MC bullying ticked me. Even thought I understand why he acted like that. BUT later on he show his true Good nature self. I love the concept, Give this a chance.

I finished reading this a long time ago, but don't really remember...
So I'm not confident about commenting about it... :x Just know that this exists and if you are curious, check it out? (i know Very useful xD )

Designer found a man in strange clothing and blood in front of his door. Despite the risk, he ended up taking him in.

Modern world setting. Slice of life of them cohabiting and slowly getting clother. Soft Mc and puppy possessive ML. ML was an Emperor in his Og world. MC has the same mole and appearance as ML spouse (male) who died (his reincarnation though he doesn't remember). Honestly it's kinda cliché but cute. A calm read but just not my type of story.