——This meaningless and entirely selfless theft is a classic element of a phantom thief story.
Yes, Arsene is a follower of the Path of Devotion.
During this theft, however, Arsene encountered a slight mishap... he stole the other's heart as well. Later, when Arsene was forced into a corner, it was Angelique who saved him and took care of the severely injured Arsene until he recovered.
Eventually, they fell in love.
It was thanks to Angelique's cover and deterrence that Arsene's actions as a phantom thief didn't show any flaws; or rather, those who noticed the flaws didn't dare to take action against the Duke of Vandome's son-in-law.
And Maurice Lebrun is Arsene—or rather, the "phantom thief's" representative in the underground world. Many even believe he is the phantom thief himself.
He only confided this to his friend abroad, Mr. Hermes... Since this gentleman before him knows this, it means he is probably a friend of Hermes.
