a while back I also lost my USER ID on dating killmulator and I was so devastated about it that I completely stopped playing, now this is just hopeful thinking, but do you think it is possible to get that account back? or I have to start all over?
I seemed to have the same issue before, and I went to the original game which was still open to my ID and logged in through there and copied the original ID, then I clicked log in in DK2 and then user ID then pasted it in there! Hope this helped!