
I really want to know how San ended up losing his memory and what's his connection to Hwan. Can you, guys, enlight me with some theories?

He can't be a reaper, though. He doesn't have any yang energy. My current guess is that he was heavily involved with Hwan's previous decapitation and had to be stripped of his "smell" (his power?) to avoid retribution. Not sure how 704 is involved and why he's feeling guilty. Maybe 704 was the one that told San to tag along with Geumsun? Or maybe 704 revealed San's sacred object/name, making him vulnerable to Hwan.

Can someone tell me where i can read the raws? If there's any?

https://m.94mh.com/comic/28619.html
a heads up each page takes a very long time to come up. If you think about dialup speeds in the 1999 thats what you will get.
I can see it. He will ask her to send the account number and she will be so surprised for that immediate answer ლ(´ڡ`ლ)