I read the last chapter and they died, which is obvious. Honestly it wasn’t a sad death, both of them knew that there would be a couple who wouldn’t be tempted. Their death was peaceful, they were both happy that they died together. After all they did live a VERY long life together.
https://thienthanxinh.com/truyen-tranh/18-nguyet-mi-moonstruck/ it’s a vietnamese translation since I’m vietnamese
brother that’s your sister in law and the QUEEN