
I think the father became like that because the grandfather didn't teach him that it was "wrong" to play around with women. I'm not sure but I think the grandfather is partly at fault for him becoming like that because the father said the grandfather didn't say anything when he did it. (I still think he is a shitty father tho. just sayin'-)

The captain is a piece of shit... Like wtf is wrong with him??

I kinda can't remember this story, just got a notification for it after what must have been years. But I did remember reading one flight attendant story, which should have had more than 2 chapters tho, where a guy gets together with the pilot on his flight, where he works at, and that pilot person then for some misunderstanding on his part, thinks the mc is a slut that does it with everyone or something? And acts like an asshole. The Author of that story tended to use that trope a lot, where the LI is being an asshole for barely any reason, hurting the protagonist (usually the uke) and it could be a great story of an asshole making a mistake and burning for it, before they actually get together, but it kinda always ended way too mellow and the uke always took it way too easily with this mangaka.
From all the comments I'm reading here, I'm getting the vibe this is actually the story we are talking about here.
The age gap is really big but idc cuz It's really cute ^^