Responses
I think this what i feel too. So i was read until 14 chap, then jump it to 48 cauze i got feel why i feel boring in the story... And then i got the answered while read in chap 48 until the end. like what you said... Their personality development... Especially for the MC is really slow burn... I expect it can get 100 chap for MC finally get imprint by seme.

i didnt realize i had read 50 chapters bc nothing much happened because they kept going in circle with their relationship. as someone else said, nothing actually got solved.
TO SUMMARIZE:
arc 1 - they became temporary partner
arc 2 - the "villain" cancel their partnership so they worked to take it back.
IN SHORT, ARC 2 just allow him to regain his position in ARC 1, sure they are dating now but they dont even imprint. Just be more lovey dovey.
IT READ LIKE A SHORT STORY SO DONT EXPECT TOO MUCH DEVELOPMENT
still, i love esper Do's personality. he's really cute and i kinda surprised he kept that act to the end. I mean, he didn't turn 180 degree and Section Chief Lee (mc)'s impression of him didnt change much since the start (same as me), but he still fell for him anyway. To put it well, you dont meed to worry about character's twist. To put it badly, there's no personality development.