https://www.mangago.me/read-manga/eng_love_me_again/
( It's complete ) I haven't actually read this , so I don't know if this is good or not. But yup MC has amnesia.
https://www.mangago.me/read-manga/a_world_of_stigma/
- this is a new story
But 2/3 times , Does a story like this really exist?
Found it : it's this
https://www.mangago.me/read-manga/into_the_blue_water/
MC keeps experiencing memory loss more than 3 times .
NO WAY THERES MORE THAN ONE HAHAHAHA OMG
There are only 2 actually.
If it's a short Korean BL , you are looking for it's this : https://www.mangago.me/read-manga/into_the_blue_water/
It's it's a Chinese BL , long one. It's the one recommended by @little mushroom.
At first I just recommended BL 's where MC suffers from amnesia only once .
Not the mc but ML, he gets amnesia like 3 times? I know it’s not exactly what you’re looking for, but I figured I might as well mention it:
Senza Replica
i heard there was one if you know lemme know