Where the first season showcased the slow buildup of the character's connection and culminated in them embarking on a tentative relationship with each other, this season explores Hira and Kioyi's slow-changing relationship as they work on building a life together and figuring out what it means to be happy, not just with each other, but with themselves.
I was already very fond of both characters after the first season, but through watching this I grew to love them more and more. Both of them have grown quite a bit since the end of the last season and as the story dives deeper into their thoughts and motivations, they start to feel more and more like real, flawed people in search of and deserving of love.
Kioyi specifically finally starts to show more of that fierce vulnerability we got to see glimpses of at the end of the last season and it both makes him a perfect instigator for Hira's deeply needed character growth, and serves to deeply endear him to the audience (or at least to me, although I don't think I'm alone in this).
I also highly appreciate how all the conflicts develop realistically and resolve satisfactorily while neither being drawn out unnecessarily to fuel the angst and drama, nor getting wrapped up too quickly or neatly in order to just get to the happy ending already.
In short: This season continues the well-paced, well-balanced, and beautifully portrayed story of two slightly strange but sincerely lovable characters as they continue to face life's challenges together and figure out how to keep changing and growing for and with each other. An actual masterpiece of a sequel.