Mainly because I'm also reading the Novel and it's amazing! I absolutely love it! No words can describe how different this is from your 'regular' reincarnation stories. It is shounen-ai, but it's barely there. In fact, it doesn't even appear a lot in the Novel, it's merely insinuated. But don't worry, the novel is proper bl.
I know it'll eventually be completed, so it stays with the read.
Mo Dao Zu Shi