Responses

It’s not the age gap but the mindset. Lucas was NOT a parent figure to Athy but more of a friend to lover relationship. Here, Clete raises Tita with the intentions and feelings of a parent and he too sort of thinks of her as a parent figure so far. It’s like an adoptive parent falling in love with a kid they raise. It’s less the age gap more of the relationship.
cmon guys... Lucas is literally Hundreds years older than athy too... and lots of other webtoons who have similar settings so you guys will eventually gonna get used to this(≧∀≦)