If you liked the story of the cop girl falling for the guy, you might like Windstruck. Both are tearjerkers.

The bromance in Soul Snatcher is just as strong as the one in The Untamed. Give Soul Snatcher a try, it is a feel good movie that will relax you and leave you feeling light.
Warning : Soul Snatcher is not a BL, only a bromance. So if you are looking for a title that only has a BL relationship at it's center then Soul Snatcher may not be for you. However, I suggest you try it as something about the movie is so simple and beautiful it will move you. Kind of like watching a nice Disney movie, like tangled.

One of the actors have acted in both the titles, as a side role in The Untamed and as the lead role in The Male Fairy Fox of Liaozhai 3. Both titles have a focus on the soulmate relationship and love between two male martial artists. The Untamed has a lot of other plots going on too, but that is because it is a series and it has enough time to explore all the other plots. TMFFL's main plot is the relationship between the main leads. Both titles are good.

Both stories about guys with powers. Both guys get the powers through experiments by big organizations. Both of them are short dramas the will likely have a part 2 that will dive more into how the protagonists deal with a larger scale of things, such as protecting their own kind. LUCA is easier on the eyes and there is not much body horror or anything, unlike in connect. Don't watch connect if you are of faint heart, but LUCA is fine, it barely has any horrifying scenes.

Both are about aliens taking over a part of the main character's body and the situations that arise due to this complication.

It's by the same director. It's a bromance. The story is a bit darker and sadder in the painted skin.

Both have bl, and the location setting is similar. The cinematography is gorgeous in both. Moreover, the acting is excellent.