filigreesails

Tbh GMMTV shows vary wildly with how long it takes for the show to start airing after they finish filming. In quite a few cases they even start airing the show before it has finished shooting (one notable example being Not Me - iirc that show didn't finish shooting until the week that the 7th episode aired!!). But then in other cases (e.g. for shows requiring a lot of CGI work) it can take months before it airs. It's pretty difficult to predict how long it will take for any given show to air lol.

Midnight Motel and Dirty Laundry have definitely both finished filming, Midnight Motel actually wrapped a couple of weeks earlier than Moonlight Chicken iirc. That's not to say that My School President won't still air first, but the entire Midnight anthology finished filming around a month ago so I really don't understand GMMTV's logic if they do rush this one out first lol.