I'm not sure if this is an actual trailer or not, and although it says it can go HD, even at the highest quality the video was still kind of blurry to me. So, I don't know if you want to use it or not.
Drama: https://mydramalist.com/9867-jam-loey-rak
Trailer (Eng): https://www.youtube.com/watch?v=7kKZIKraOS8