Court shoes vs running shoes — please stop
Running shoes belong on roads. Court shoes belong on courts. The difference is your ACL.
Running shoes are built for forward motion. Badminton is lateral, explosive, multi-directional. Wearing runners on court is how you tear an ACL.
A real court shoe has a flat gum sole, reinforced lateral support, and a low profile so your ankle stays stable when you lunge. Spend the 4,000 baht. Your knees will thank you in ten years.