^ Either the negotiations for the female lead isn't finalised yet or maybe GMM25 and/or Change 2561 doesn't see the urgency to announce this yet given that their existing projects are all delayed. I think this is airing sometime late 2020/early 2021 at the earliest, assuming GMM25 will air new dramas by July (around the time "Game Ruk Ao Keun" re-run has concluded). 2 dramas that are likely on the MT timeslot ("Fai Sin Chua" and "Rerng Ri Dtaa") have already shot substantial materials and they're likely to occupy the timeslot until November.
Plus Mr. Koo has a lot of dramas in his queue. Aside from this, he's got another one with GMM25 ("Dtaem Rak" which is likely airing soonest amongst his upcoming works), 2 with GMMTV ("Devil Sister" has no updates though, but "Thonhon Chonlatee" has just started shooting but it's slated for 2021), 1 with Amarin ("Bangkert Klao" which is said to have fitting this week), 1 Club Friday ("Rak Sap Son" which should air soon as well) and 1 LINE TV exclusive ("The Secret" which has no updates as well). The man is such an energiser bunny 55555+.