Aw hell, this was just so much fun.
It did feel like I was reading an at times somewhat poorly plotted AU, but these characters just have so much charm and the actors have such great on-screen chemistry that I couldn't find it in me to care.
This special is quite light-hearted and fluffy compared to seasons one and two (which, let's be honest, were already quite sweet to begin with), but what it lacks in dark mysteries and epic sword fights, it makes up for with romance.
Watching this felt like someone had grabbed the romance dial on the switchboard and cranked it up to 11 and I do mean that in the best way possible. The show is full of classic romance tropes and even invents a few new ones (dramatically pretending to be injured to scare off your girlfriend's evil adoptive mum, anyone?).
It's cheesy, it's ridiculous, and yet it's somehow genuinely touching and romantic. I even found myself tearing up at one point.
So if you're a fan of the main show you'll very likely enjoy this as well. If you've never seen Legend of Yunze before you might still like this, but be aware that quite a lot of plot points won't make very much sense without the relevant background info.