Review Detail of _San_ in Demonic Dragon Reincarnation: I am contracted by a sexy lord

plot: MC reincarnated as demonic dragon on high plane, is summoned through contract to lower realm to be a hero of a girl, the girl is taking care of the boring stuff while dragon is sleeping and using stuff (using resources, money etc.) later known for that as cheater xu. go read for this interesting plot story. background: some time ago earth or whatever it is, met another plane so in the end people could cross realms from earth to the other realm, where people get their hero & territory and strife for good ranking, resources, buildings and military units.