User blog comment:Lordranged7/Voting for Pics/@comment-4880952-20121212144101/@comment-2.33.108.190-20121212162756

I agree with SnowyBoy, I found this on tumblr:

"Mystery Supporter X is Fei’s father (don’t think much about him being an old man, Second Stage Children live shortly) Kinako is his mother (who travelled back in time and got young, idk, or not it’s entirely possible she gave birth to Fei like that because of look above)"