First off, let's rule out the Lord of Envy—Clown is absolutely not a suspect. That leaves the other six Demon Kings as possibilities.
According to Hexuno, the devil hiding in Lundan is incredibly powerful and has been here for a long time. Whether it's still in Lundan remains uncertain. As a precaution, she hasn't returned to the Papal State.
Then there's Mona stirring the pot—the devil is just one aspect. Hexuno doesn't want to go back to the Papal State because she's afraid of major social embarrassment and can't face her colleagues.
In summary, there once existed a powerful Demon King in Lundan, deeply hidden, and Wayne guesses Uriel has come to eradicate this devil.
Good news. With Juno working undercover, Wayne can stay behind the scenes and swoop in to claim the credit.
"Pardon me for asking, what do they call you in Heaven?"
