angst

Because of a trauma losing his colleague senpai, seme was being mean and said bad things right on to uke's face, he did that on purpose so that uke will hate him.
Uke got a heatstroke in chapter 2, in chapter 3 uke got injured because he shielded a child from a falling rock on the mountain. Seme then realized if uke had died that day trying to save the child, he couldn't live without uke.

Seme was just toying with uke because uke resembles the crush from highschool. Uke then found out about it, beat seme and broke off their relationship.
seme realize he loves the uke later on, but uke ain't having any of that shit anymore. He denied seme advances for some time, but at the end he forgives seme.

Uke bullied seme in the past. In the present he fell in love with seme, seme agreed to date so that he can break uke's heart. Payback for bullying him back then

Angsty at first bc the seme forced himself on uke. But then the it turns out that the uke didn't mind about it at all, in fact he was waiting for seme to take advances. Kind of fluffy at the end. That kind of omegaverse where where omegas are treasured