Board Thread:Questions and Answers/@comment-32556318-20170712153049/@comment-36009152-20190617203853

An update that as of Chapter 79 it is still uncertain! The past Yu had seraph wings even back then but it is right back to square one with as to whether he was born like this or experimented on. Then it's another matter entirely for the present day Yu. For present Yu could guess he was implanted with the seraph gene then his 'parents' found out but the entire background is still in the dark really.