I'm not completely sure what Aom meant since she didn't go into details on how they casted the leads. I think the actors and actresses receive scripts and projects all the time and they choose what they want to do. Aom sort of said along those lines. I think what may have happened was, before they finalized the leads, Aom probably asked Sean and Vill individually who they wanted to work with to get a feel. So if Sean said someone else then I think Aom would have taken that into consideration. If Vill said someone else, then Aom would have considered that too. Then depending if Aom wants Sean more or wants Vill more, she'll probably go with that choice. Luckily, Sean and Vill wanted to collaborate and it was just meant to be.
I think they had flexibility this time versus when Aom specifically wanted Tui for Rang Mai Hua Jai Derm. So it was just up to Vill whether she wanted to join or not.
Sean mentioned that the elders wanted Sean and Esther to collaborate on a new lakorn together after Ngao Asoke but I guess, they won't be accepting that request due to the latest scandal. Lol