Responses
The only thing I notice that's clearly copied is the fact they're spies or people who have knowledge that's useful for the time period they were transported to but this one is clearly coping a ton of shit from one manhua way too much, it's not even trying to be its own thing. Using 1 or 2 things from another manhua as inspiration is fine imo but this manhua isn't doing that at all.
This manhua is copying from multiple manhua.