Maise already have so much clue.. but she want to ignore it because she love him so much.. i don't think eith will reveal the truth himself.. so there one point where maise get so strong demon magic won't work on her anymore and she have to accept the truth that eith is actually a demon king..
The blonde hair guy at the lake seem to be the first prince and also the main lead but why he look like 12 years old kid....