I read the novel first. It was a few years back and I've read a lot of other Reincarnation stories back then. I then saw the anime adaptation which is where I was first exposed to their character design (I watched this like, almost a year ago?) And of course, by the time I read this, I knew who they were. It just took me a second to realize that it was the same as the novel I read before.
oh wait, I watched the anime earlier this year and THEN I read this. I also read the novel at Wattpad where I had no clue that it was legitimately published (cause Wattpad is full of stories by its users. I basically read a pirated version of the novel.) Lol, I mean, it sounds like cap so I don't really blame you ╮( ̄△ ̄)╭
I've read the novel, manga, and even watched the anime all while not knowing that this was the same exact story Σ(  ̄□ ̄||)
When I was watching the anime, thoughts like "Hey that seems familiar" would pop up. BRUH I DIDN'T KNOW THAT I ALREADY ACTUALLY KNOW THE STORY AKJDHBKWJ