aaah my favourite trope. here are some that are missing
- Marriage not Dating (one of the best pretend relationship dramas)
- Legend of Yun Xi (historical/fantasy) (the main couple is so. good.) but doesnt fit your criteria because it has ambiguous ending. still one of my favourite dramas
- Something about 1 Percent - the OG contract relationship. short and sweet, well made, good watch
- somewhat fits: 100 Days My Prince (fusion historical so its not really "accurate" not much of a palace politics and stuff- he loses his memory, she pretends shes his wife)