They are both set in a fantasy world and are costume dramas. There are complicated family backgrounds/lineages and its a very similar vibe/feeling. Also! It just so happens that the FL of Twin Cities starred in this drama as well (as a second FL of sorts).

It's also xianxia and it's also extraordinarily well written.

As with every fantasy drama especially, a lot of animating and cgi needs to go into the production since the setting includes places like Heaven, Hell, and various other "realms". The realms were all animated so well, and while there are TOMPB vibes going on (esp. the flower realm and the heaven realm), it stands distinctly on its own beautifully.

The characters are also similar in that they make you so emotional and the feels are very real.