Rex couldn't control his face anymore.
His mind was being overwhelmed with new information that he never knew.
Bad side?
Hearing that the Angels also have a bad side was quite surprising.
Despite the atrocities done by the Supernatural and Humans, he thought there would be one true good.
A race that was really righteous to its core.
But it seemed that was nothing but hopeful thinking.
Then again, from his discussions with others regarding the Angels in the ancient era, every single person he talked with, which also includes the System, stated that the Angels were someone righteous and bear the burden of protecting the weak.
A sole beacon of light amongst the darkness in the ancient era.
Rex was given that kind of impression about the Angels.
Not only through words, but their expressions also conveyed the same message.