I was like, I have read something similar but I couldn't remember the name. Luckily now I ...

Thanks for recommending it !! I didn't know that one , i liked it !!!

I also recommend these two, they’re not really fluffy stories though so just a heads up! Ml’s both have multiple personality disorder, they’re called Adam no Rokkotsu and Double Trap.

https://www.mangago.zone/read-manga/adam_no_rokkotsu/

https://www.mangago.zone/read-manga/double_trap/

Oh yeah Adam no Rokkotsu too. I remember it now that you mentioned it.
But I haven't read Double Trap though. It looks dark. Can you give a little synopsis about it.

yesss, honestly it’s been a while since i read it but basically the mc had a one-sided crush on the ml for a very long time so there’s feelings there already. anyway, they end up having to move in together and everything seems fine when all of a sudden the ml’s flirtatious and assertive side begins to come out at night ONLY.

here’s an official synopsis:
Jinsung has always had a crush on his next door neighbor, Yura, ever since they were kids. Due to unforeseen circumstances, they had to move in together and they practically became brothers. Jinsung eventually gave up the thought of ever becoming Yura’s lover because Yura would draw a line in the sand each time he tried to reveal his feelings. But one night, Yura’s behavior begins to change. He seems to be turning into a different person in the evening...someone with an insatiable lust for the physical… Jinsung has to admit, a side of him does enjoy his feelings being reciprocated, but this feels wrong and unsustainable. What’s gotten into Yura and is there something more sinister at play…?