Since korea boo . com is banned here, here is the link for the source
The issue is about Sieun and Sumin singing a curry song that is viewed as offensive for indian Kpop fans. I don't know how big this issue this is, but on every recent SNS posts by StayC, people are spamming asking High Ups and even the girls to apologize for that.
This the supposedly the video people are angry about
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Don't want to take side, but I hope this gets resolved soon....