See, directors and producers don't only cast Kim in their lakorns because she's the only available actress, or because of her popularity only. Lol. Sure, those are contributing factors (just like how they are contributing factors with every other actor and actress), but they also cast her because they see her as perfect for the roles, they believe she's talented, etc.
Pa Jaew praised Kim after working with her in RP, so I'm not surprised to hear he was set on casting Kim in here no matter what, even when she was hesitant and didn't believe in her own self. Just like how P'Dang (P'Off's wife) praised Kim after acting with her in RP, and later personally requested for Kim's queue to be in the mafia series. It's also the same with Anne continuing to cast Kim in her productions-because she believes in Kim's abilities.
Anyways, hopefully Pa Jaew's vision for this lakorn will be delivered. Since he's not directing it, we have some hope for cute scenes between KimJi (not just staring and fake kissing scenes). Hopefully, he gets a promising and well known director.