first chapter they talked about how the sister of the ML didn't look at all like him. Plus, the FL is having some reactions just like His majesty with the stone, which weren't supposed to happen even with that bracelet, her powers which may be sleeping in her, the way she appeared on the ML's office even though it never happened before (like, as if it recognized her bloods as the same as him), and she can see the ML's eyes which seemed to be an amazing/impossible thing by the reaction of the guy (I just can't stop thinking about how it would make sense if the babies were switched at birth, with the FL's powers being sealed.)