there has been only 3 that I can watch over and over again.
ka nueng ha, patson and ning vers (probably over 15 times and I'm not kidding, I still watch it whenever I have nothing to watch)
ruk prakasit, num and ning vers (I lied, I can only do the beginning and middle lol last 4 episodes is a no no)
oum ruk and sood sanaeha (pretty much a tie. I have seen sood sanaeha as much as I have seen oum ruk)
oh I lied I forgot about klin kaew klang jai.
I have many favorites but I don't think it is worth rewatching, just selective scenes.