
Basically, MC was born in the past.
Mc mother (which I'll call mother) is from distant pass of 1000? Years ago. She was queen fairy and got experimented on til she lost it and made the dark forest. This also made her to run to the future. Where mother met father.
After mother met father, they loved, and made 3 kids. The 4th (which is MC) was inside mother's belly when mother started to get sick as consequences of not in her right "time" (cuz she's from the past). Thus, she's about to "explode" and because she doesn't want to harm her family. She went back to the past of 20 years.
Making it MC being born from a Fairy who "exploded" or went havoc.
So yeah- MC is the 4th child who was born in the past making her the oldest.
After seeing the spoilers, I get it how FL is this person's child and how it went but.. still skeptical about the age difference of the couple ╮( ̄▽ ̄)╭