LWY is not a narcissist, he's a literal psychopath and a realistic one at that. Yes the vulgarity can be uncomfortable, but it's not really out of place knowing his character and if you don't like it, you shouldn't be reading this...
And basically saying that inseop needs to just "man up" is such a stupid way of thinking, sorry I really mean no personal offense, but the circumstances and personality traits are very important to not forget if you want to understand the reason behind their actions.
Inseop's character was already very timid en forgiving even before he met LWY and that's not suddenly gonna change??? Especially in the situation that he's in, even when he tries to go against or decline LWY's "requests" (we all know that there is only one correct answer), LWY just does whatever he wants and coerces Inseop into doing that by threatening him or others. So at that point, what can he do?
Also mind you, LWY has his passport AND his phone, he literally has no recourses to escape him. Do y'all remeber what happened to those Chinese-Korean guys?? Right...