Is exupdev a scam, or is it legit?

This is a fraudulent site. I invested 30 million won based on a recommendation from an acquaintance and made a profit. I tried to withdraw cash, but the chatbot said that there was a duplicate login with my acquaintance's ID and asked me to pay a penalty. They said that after paying the penalty, I would be able to withdraw cash. So I deposited another 30 million won on the site as a penalty, but when I tried to withdraw afterwards, they gave me various unreasonable reasons to pay another penalty. I don't know how long this site will exist, but they are definitely preventing me from withdrawing even a single won. Even if I ask them to deduct the penalty in dollars within the site, they only ask me to pay the penalty. They are complete scammers.