Aurorab

Yeah, I agree we probably will not see eye to eye. Egotism, over confidence and entitlement might sometimes stem from the same source of an overinflated sense of importance but they still mean different things. Like I said, I don't think Ki Jun is entitled because he does deserve the promotion based on his past work and performance.
Also, you are simplifying the issue by making it about status and image. You mentioned ladder climbing but seem to forget the most significant aspect of that which is most employees will gun for positions that will give them a better shot at promotions, career advancement and better future financial benefits. By his description of Team 3, that wasn't ideal team for it.

The head of the team was passed over for promotions anumber of times and that doesn't exactly assure someone who has had multiple promotions since he joined the department that his career won't stagnate by staying in team 3.

It's understandable that you think he should act with more humility while not looking down at the new role. I felt the same way too but it's still quite understandable that he is upset that he is essentially being handed a role that will likely not do much for his future prospects. Also, one he considers less challenging or interesting though he might be continually proven wrong on that as he goes. If he even decided to quit and move to another job, I doubt he will get positive consideration for another audit role if his CV state d he was moved from investigating financial crimes to investigating public morals. The human belief would be that he had done something wrong to be taken off "bigger" cases.

Added to this is the fact that the boss had no good reason to put him in Team 3 apart from the fact that she saw him kissing someone. And it is also likely that she took him out of Team 1 to get him off the case he was investigating. It becomes an even more unfair role change.

He needs to learn humility but his grievances are understandable. He has every right to ask for his performance and efforts to be acknowledged despite having an egotisitical view of himself. After all, despite his boss' constant sarcasm and scathing replies, she has never once accused of incompetence in his previous role.

I expect that series might have him grow into and learn to appreciate his role while picking up useful knowledge as he goes.
But I hope they don't make the story out to be him becoming inexpicably satisfied with his new position with no thoughts for change as that wouldn't be in character

Anyway, long story short, we are agreeing to disagree.

No, that's not being entitled. Entitled is thinking you should have something you don't deserve. What you're describing is more like overconfidence or being egotisitic.

I also don't think it was a demotion exactly but there was definitely a reduction in status. Basically, everyone in the office considers team 3 to be the squad where people with less than ideal performance are thrown. Like anyone who trained for years to investigate financial crimes and the like wouldn't want to be stuck investigating employees' love affairs. If it wasn't a drama, it would considered a severe waste of human resources to have an audit team created just for that. Not to mention, having one of their top performing staff transferred to that team to focus only on those tasks.

True, he shouldn't take it out on the team but at least, he is not snobbing them. I kind of expected him to.

I don't see him as entitled. It has obviously been proven that he is a hard worker and he does his job well. He was performing really well in his initial role, even going above and beyond so moving someone that competent to a smaller role makes no sense.

There was actually no good reason for the FL to move him to Team 3 and it's understandable that he felt shortchanged. Rationally, he should have resigned by now but the plot obviously has to keep him in the company for the romance to happen.