
The latest chapter (ch 62) clearly shows how the ML tried to reach out to her, and the letters were stopped somehow. Sure, you can say he put some effort? But in that time I think it says a lot on how disappointing their romance is going.
To begin with, the FL is mentally an adult, who fell for a possibly mentally adult 9 year old- And it's just a theory since he himself said things came naturally to him like he experienced it before? But it's never clarified. I don't really understand where her love comes from