Responses
Pretty sure, as our MC remembers the memories he's meant to remember, it makes the soul pieces of Qin a little stronger and quicker to recall previous world interactions depending on the action, prop, ect. Don't hold me to it, but it seems that way.
I guess Xin Qian got the memory back from the previous time that the original pink-hair was an antagonist?
So Xin Qian probably don’t remember other worlds