help plz

trying to find a manga were
its a isekai with FL
she is set to marry the prince
but tells him she is going to become the villain because he will fall in love with the pretty lady later down the road who joins the school
the prince finds this funny and tags along to watch it happen
she tells all about plot and he fixs it before it can even happen
she is to nice to be evil and fails at it
so can anyone find this?