You've obviously been reading some other manga and this comment must be a crosspost, because saying "just be nice to him" would only get her to the grave.
The emperor is a crazy psycho, standard common behaviour like niceties and pleasantries BORE HIM terribly. She needs to keep being entertaining and thinking out of the box in order to survive, and being nice to him it's definitely not entertaining enough.
Right, like he's illogical, the literal avatar of the god of war. The whole point of the manwha is to say that 'he's insane and she needs to put her wits together to survive this mess'.
like her whole goal was to survive. like girl if u want to survive just be nice to the ml ITS NOT THAT HARD OMG