Please flush your DNS for the test and restart Firefox
embed.koreus.com should not resolve 5.39.70.224 or 2001:41d0:8:88e0::100

Valid IPs for the test :
62.210.201.242
62.210.181.39
192.99.10.164
2001:bc8:323f:200::1
2001:bc8:323f:100::1
2607:5300:60:3ba4::1