I think this is a big difference in Kdramas and American shows. In the US the actors can misbehave, cause scandals, get arrested, and basically behave in ways your mother would prefer you not behave.....yet their careers are not always affected negatively.
In contrast, Korea is very scandal sensitive. If an actor has a minor dust-up... like using insensitive language, or arrested for pot, or lie about dating.... then they risk their entire career. The fans do not tolerate any type of misbehavior.
There have been many shows that had completed filming and were ready for release but one of the actors had a scandal and the show was completely re-filmed with a new, replacement actor. Or, the show is simply not released. An example of this is The Match featuring my favorite Lee Byung-hun & Yoo Ah-in. This movie, about two Go players, was completed in early 2023 but has not been released yet because Yoo Ah-in was involved in a drug scandal.
It may even be the case that in the US their careers are enhanced with the bad behavior!
Yes, in the U. S., bad actors (i.e., convicted criminals and scandal-ridden celebrities) have succeeded in being elected to public office. In Arkansas a convicted sheriff and state congressmen served sentences and been re-elected. Psychologists explain voters' endorsements of bad actors as cognitive dissonance. For example, you find a candidate's behavior morally reprehensible and vote for them anyway, which violates your own moral code! Such voters justify their endorsement of the offensive candidate with excuses like "I don't like how they treat others but I like their position on [whatever];" "They are a creep but they are anti-something-or-other and so am I so they get my vote" and "I know they are sinners but they should be forgiven." Forgiven, ye…