I disagree. I would argue its the FL cuz shes older than him in age. Time regressed her physically sure but its still her original body so instead of negating her age, it added to the years shes been alive thus making her more older than the ML. In fact it would have disturbed me if she ended up with someone who didnt know her true circumstance even if that someone would be close to her physical age. It would feel like grooming from her.
Besides, he found out it was her from the very start. He just confirmed it more the more they spent time with each other.
Its actually better she ended up with someone who knew her from the start or else she would have ended up alone. Cuz in my opinion if it were me in her shoes, i would not date any guy in my "physical age" cuz it would just feel like taking advantage of the kid. But thats just me.. ┑( ̄Д  ̄)┍

I swear the male lead in this is just a predator period Even if her mind is of an adult, he doesn’t know that yet, like he lit, groomed, and then confessed to her while she’s still a minor. . Yo, these pedophilic mangakas strike again