My opinion with a little spoiler.
I believe there is another character in the future that is more a Soulmate to him hahahaha but that's just because they are complete opposites, and they get along pretty well. Even his Sahyungs says that they are the best match of a person. Of course, nothing romantic, just their personalities matches too well.
Who is it?
I also wanna know!!!
SPOILER
It's Lim So Byung, the king of the bandits. Even the Hua Disciples says that he is the perfect opposite and match of CM since he is half-bandit and CM is half-taoist. Even their personalities blend pretty well. He appears around chapter +440 so half the story so far.
The Mc collecting a harem of strong boys. May the yaoi gods make this manhua's future zesty!! ヾ(❀╹◡╹)ﾉ~
Tbh I don't care if their relationship is romantic, platonic, or familial, all I know is that it's special for sure. I don't know if I'd go as far as to say they're soulmates (which doesn't indicate romance btw), but either way, I love seeing more of them.
That being said, if anyone knows any good fics with the two of them, please do share ヾ(☆▽☆) again, don't care what kind of relationship they have in specifics so I'm good with all, romance included