I don't know how it works in the mod, but in the base game affection is a zero sum game.
A girl can have a maximum of 100 points of affection distributed among all men. So we can think of it as a pie chart.
Let's imagine Blue has 50 Affection and MC has 50 Affection. If Blue gains 10 Affection, then the new split will be 60-40.
I am not sure how the distribution is handled when affection is split between 3 or more men. If one gains X affection, I suspect the others lose an equal portion of X.
The Korean mod description, feature #2 says
"More than a certain number of organisms and satisfaction results in a decrease in affection/development for men other than men who have sex"
Does this mean the formula has been altered and the sum of all Affection can drop below 100?
I think it is inevitable that Affection will gravitate towards 100 as a character approaches 100 in the Development stat.
As for 100 Development, I like the way it works in the vanilla game.
Once a girl reaches 100 Development, she has fallen for that guy and will begin helping him corrupt other girls.
The way this manifests in game is that she will take up a room and refuse to move (similar to Max, Linus, Blue) forcing you to find another girl to tank the guy's libido.
I think the retirement feature is unpopular because it removes the ability to interact with that character. It sounds like she would just disappear from the game. In addition to that, it sounds like it would also reduce Inn difficulty because she would no longer be able to help the guy corrupt other girls.
I also think that "the girl that once shared a bond with MC continues to be defiled by other men in MC's presence" is a more appealing NTR theme than simply "graduating".
I think character retiring and moving aways is a good RP theme for an event that would happen once or twice in the story (such as Liesel), but having it become a consistent and predictable outcome makes it less enticing.
