Because that’s his adoptive father……
He's more like a sugar daddy at this point lol
The nature of their relationship is not like father and son ╮(￣▽￣)╭. It's unsettling to read because after doing the deed , he still calling him father （(⊙…⊙ )
Also I think the mc is a literal child, like....
True (￣ε(#￣)Σ
Why he calling him dad