Does your Pro Plan include CDN use in South Korea?

Here says no, Seoul, Korea: CloudFlare's 23rd Data Center

But i just wanna confirm

I don’t think so.

If you’re asking why, here’s an article for you to review:

Basically the bandwidth cost in South Korea is high, therefore it is hard for Cloudflare to peer with your ISP economically. If I am not mistaken you’ll need the Business/Enterprise plan to be able to use the South Korea Data Center. While Free/Pro user will be redirected to the closest cost-effective data center.