Okay, so i got this info from a friend of mine and both of us have talked about this in the private messages. If you wanna know why there's Huening Bahiyyih and Taeyeon in the trending actors list, is because apparently, some user and her clone account have been spamming stories (including marvel stories) with K-pop idols. They spam K-pop idols on anything including non asian roles, and sometimes downvote other casting suggestions that they see as an obstacle to their K-pop idol casting suggestions.
The usernames in question are:
1. Cameronbae (https://www.mycast.io/profiles/92675/username/cameronbae)
2. Dslutz (https://www.mycast.io/profiles/96956/username/dslutz)
Proof of these two being clones is that both of them are from Italy and suggests similar set of actors, and even vote "Yes" to each other's casting suggestions in order to boost up their own suggestions so that they could come out on top.
Again, the main issue/problem with this user is not because they're K-pop stans, but because of them using clone accounts for their own personal gain, which is against the rules of this website.
I recommend that you block all of this person's accounts to keep the voting system fair in this website.
NOTE: i don't have any particular hate towards K-pop in general, but what this user is doing is against the site's rules.
And to that extent, i'll update this post if this person make another clone account. Because who knows, they might make another one.