Deal!

'A living being?' It wasn't only Luman who was shocked by Rean's words. The same could be said for Abelha and the barely awake Librao. It didn't matter how they looked at Luman. He was definitely a Devil... or so they thought. 

Yet, Luman suddenly opened his mouth and started to laugh out loud. "Hahahahaha! Impressive! I've never thought someone would be able to see through my disguise. I even met an Elder Devil before, and he also couldn't see through it."

The reason Rean could see it was quite simple, Life Force. All living beings had Life Force in them, and that included the Devils. However, it was clear as day the difference between the Life Force of Devils and the Living Beings of the Realm of Gods. Even the Light Devils were no exception. It's just that Rean was the only one with a high enough Light Element Affinity to be able to see and feel that.