
I want to know what did the teacher see when he looked at Sangjil with his superpower...like his potential and growth! not to mention that Sangjil is very clever. and very fit to be a leader. maybe he can advance to not seeing just people's date of birth but also their death date or place of birth or something else. I don't know.
If he consumed humans like the regular tengu does he would be incredibly strong and has a fast regeneration.
but he would lose his humanity.
this reminds me of Tokyo Ghoul.