Right when Long Chen was thinking about leaving to steal the item he needed from the treasury of the Western Emperor, the greatest thief of Immortal World was also thinking the same.
He was known as Glaze. At Least that's what the world knew him as. No one knew his real name. They didn't know what he looked like or where he lived.
He was also the same person that had stolen the lie detection artifact from the Northern Envoys that was given to them by the Northern Emperor so the envoys could check if a Heavenly Demon Spawn had actually appeared in the Mortal Worlds.
Glaze walked towards the Royal Palace before ultimately turning into a shadow and disappearing.
....
Long Chen sent the Snake Monarch back before he left the hotel through the window in the middle of the night. He was dressed in all black as well.
Leaving the hotel, he used Shadow Transformation, which seemed similar to the skill that the thief had used. He disappeared as well.