
Didn't he said he never wanted the king position from the start?. If i remember correctly; he never wanted the crown because of what he witnessed what happened to people around him during his childhood, with all the fighting and assassination attempts, and abuse the royals go to, and he's only a temporary king because his younger brother is not fit to be king at the moment, (plus the promised he made to step down from the king position when his younger brother comes of age) play a role in that too, so in a way, he wasn't going to continue being a king whether FL got involved in his resolve or not.

OP is incorrect about why he stepped down as Emperor. This was a decision made before the beginning of the story as a deal between him and one of the Dukes to protect the prince. The FL had no influence in this. Its less of a 'give up' and more like he was just filling in a role and once the prince comes of age the Emperor title will go to him. When Killian revealed this it cleared up a lot of misunderstandings between the two and their romance progresses further. I recommend reading the novel. Their romance is quite slow though. I think translations are onto 190 now?

ML did not give up his position for FL. He was just a temporary king, his younger brother is not of age therefore he's too young to be king; due to a promise ML made with one of the dukes, he became a temporary king until his younger brother comes of age he'll pass down the throne to him. The FL didn't have any involvement to ML's decision to give up his position as king.
so i am dropping this because of the spoiler. Don’t get me wrong i love the ml but i seriously can’t tolerate characters who just give up everything for one person and all. Yes it’s not a bad thing but i kinda wanted the ml and fl to live while ruling in peace. It kinda sucked how ml gave up his position for fl