Basically the backstory (which is supposed to be what makes us ship them!) we get as ship introduction is a rolicking tale of why the ship is a terrible idea and Wang Zheng deserves better. Like someone who has murdered zero of her relatives. All that left such a bad taste in my mouth that I could by approximately zero of their cute moments and acquired a lasting dislike of Sang Zan.

in the novel even more than on the show, where we don't really see as much of it (but I'm sure it's still there).
My approach to canon is that if we didn't see it onscreen on the drama, it is not canon. Zhao Yunlan doesn't come across as particularly possessive, just very appreciative of his Shen Wei and super in love.