I have read so many different BL's and this one will always have a special place in my heart
same, bro
Lmk if im wrong but this is just my guess. Hyo-un fed the orb to Taehyuk to try and save him, in result taehyuk lost all his memories of hyo-un whilst hyo-un used up too much if his energy on the orb and transformed back to his kid version.
I love this manhwa and the characters but the way it ended sucks, right after we couldve gotten development on a side couple it just ends
the ending sucks, tbh there should have a been a side story about the his brother and pilbum or wtv his name was.