It's difficult, you already saw most of those I could have recommended. And without amnesia at that ! lol
I see you didn't wath many period dramas.
If you're ready to give it a try, there is Gu Family Book (about a nine-tail fox falling in love with a human) and Faith (time-travel fantasy drama)
I'd like to recommand one I think you'll like even if there is amnesia because it have more influence on the mystery plot that the romantic one :
Who are you. I noticed you gave high ratings to dramas I could have recommended so I think we have similar tastes. On a mission, a policewoman gets attacked while her fiancee (a policeman too) gets killed. 6 years later, she wakes up without any memory of him and don't remember fully her agression. AND... she discovers she can see ghosts. In charge of missing objects, she connect with spirits related to them. Her new subbordinate is a young man not really glad to work under someone who got her promotion only because she was in a coma for so long. Plus, he doesn't understand how she can solve all those crimes although she's not supposed to lead any inquiry.