Well age doesn't matter in that era unlike the modern there's a few people had those age gap couples it's not even suprises example is Lucas and Athy there age gaps far from you think. Also I'm kinda like you who had a problem to the characters age when the first time reading a manhwa age gap between couples tho I grown use to it every other manhwa I read involved age gaps. What I don't accept is if it involves to ra** or sexual harassment, there is a manhwa Ik that the ml got ra** by his mother close friend that becomes his tutor (I think) then he raped in his young age because that woman what his seed to had an hair honestly pretty mess up.