Both are mini dramas
Both have general FLs
Both FLs were murdered by their P.O.S partner. Husband in WWWMYP, Fiance in Stunning the World.
Both FLs have a nasty green tea b... half sister who has an affair with their husband/fiance
Both FLs come back in time after they are murdered
Both FLs get a nice supportive partner in the new timeline
Both are surprisingly enjoyable considering its low budget.

What's Wrong With My Princess is based on the manhua: Revenge of a Fierce Princess. I think Stunning the World might also be based on a similar manhua but not sure
This one has more action and feels wilder probably because the episodes are so short.