In the client mode router, all the LAN connection wired computer will get ip addr from the only DHCP (another host router). But the client router itself won't be about to access internet. It can ping the host and any other ip addr in the same subnet.

/etc/config/network
#### LAN configuration
config interface lan
    option type bridge
    option ifname eth0.0
    option proto static
    option ipaddr 192.168.1.8
    option netmask 255.255.255.0

had already tried adding "option gateway 192.168.1.1(host)"

Any idea? Or is it possible?

Thanks