Best friends' story exaggerating so much that it becomes so toxic. Tully the selfish woman who always want to be depended on someone and Kate being such a simple,confused and broken person who's not really valued for who she is but whatever she is behind Tully's name. Everything is about Tully even in Kate's family.
Wouldn't recommend to spend time watching 2 seasons.
I found Katherine Heigl's acting to have same pattern in this and in Suits. Same body language and intimidating attitude. The rich know-it-all type!