I wondered a lot about it! Does anyone know whether he knows or not?

If you don't know then what do you think? And if he doesn't know about it then what would be his reaction when he figures it out?!

(Mephisto is one of Satan's sons and he IS an exorcist,despite that he laughed when Rin told him about his ambition of becoming an exorcist disapproving that Satan's son can become an exorcist!)

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