Review Detail of Daoist_Darkchild in Sign In: Becoming A Great Spell Deity Starting From The Magic Academy

So I was enjoying the book until Chp37. Author, explain to me the little girl who the MC met when she was 5yrs old and he in his 20s, tell me why you made her the love interest? I get that it's fantasy but maybe it's because I don't like harems but it's a bit groomish and pedo.