it was stated at the start that his body he has right now is a revived body, so he was hiding his appearance so not to get noticed by someone who might know who the body was before he took control of it.
by answering "i have no idea they did that, i actually nearly got murdered by them in the forest, this little girl helped me" he can pass further questions
I think claiming amnesia would be the safest route. "Sorry, I don't remember anything past two years ago". Some may be fooled by "never heard of him", but I don't think it will be the best solution.
@Kisato and take comfort that i've seen manhuas a LOT worse than this. like, so bad, you still don't understand shit for like 10 chapters, then when you do, it got time-jumped so hard you thought there's a missing chapter
@firefish5000 lol I thought the same at first. but as it turned out, they are different (somehow) and he didn't steal his coat, rather it got stuck to the button of that (duplicate) person's sleeves. But what is more amazing how, that shawl/cover came undone in an instant without much effort, even though, it looked pretty well put-on around the MC.