Technically should be a BL as there is unrequited (?) love going on here protecting Koon.
Ugh. I hate stories like this.
It's the typical gay man's 'unnatural' love causes destruction and there is no happiness only death and tragedy.
Hollywood gay stories when all of them ended up in death.
Of course, Kiisa kills the love out of jealousy. Of course, Koon may fall for Kiisa but Sanka still rules him and causes his destruction.
The Closer