It may be that he just had a little accumulation, and the whole person drifted away, or it may be that the old man reminded him of his only relative, the grandfather who raised him until he was in his early 10s but unfortunately passed away. Lumian chose to give some help.

Although he failed to save the old man's life in the end, Lumian sent him to the crematorium and buried him in a free cemetery.

The blue-black symbol was what he found on the old man's body during this process. Since then, he has often dreamed about a large gray fog.