No Internet Connection in OpenWrt Panel

Everything are still the same in the SSH

The only changes I've made is the Network Interface I've created in DHCP, Alongside Static Address.

I tried accessing OpenWrt in DHCP with the IP Address assigned on the Main Router, But the browser displays "The Page Could Not Found", Meaning OpenWrt is not available in DHCP. (The Static Address of 192.168.123.254 is still up as Code 200, Removing this Static Address could ran into problem as DHCP is broken.)