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Qin Chuan found himself transmigrated into a mysterious fantasy world. Not only did he unexpectedly gain a son named Qin Zi, but he also acquired a cheat code—a system that made him stronger every time his son caused trouble. Upon realizing that Qin Zi was a weakling with an immense amount of plot armor, Qin Chuan embarked on an endless journey to troll his son. This original webtoon is officially translated into English and Japanese.


Incest aside, since that is not our initial focus of conversation...
The keywords of what you said are "nowdays in most countries". Is the world of this manga "nowdays" and "most countries"? Context matters, man/miss. Did you consider why they, the characters, did it? of the situation they are in? Of the lifespan during their time?
Also, I didn't ignore your initial point, I even probe at it, tackling on what is the problem of said point in this context, namely its foundation.