Well, it was based on a BL novel, but because of the censorship in China, they had to tone it down. But, believe me, the relationship between the two main male characters is very deep and sweet. They have called each other "soulmate" several times. Furthermore, I would consider their relationship as more than a simple friendship or brotherhood. You can clearly see how much they care about each other.
Can someone spoil the ending for me? I know the drama won't follow a BL ending, but I don't want to get too invested…
I think someone already talked about how it ends here in the comment section. Just scroll down and you should find it easily. It has the "Reveal spoiler" option.
As far as I know, the novel ends pretty much the same as the drama.