Help me find manhwa

I have read this manhwa some time ago and don’t recall much but I hope it will ring a bell

1. Female protagonist, in a position of power (probably empress) through marriage.

2. She has long black hair

3. the mood of it is pretty tense, it wasn’t a lighthearted read at the very least

4. one specific scene that I recall is during a hunting tournament protagonist falls/jumps off a cliff

5. she doesn’t have a good relationship with her husband at least initially; mostly mistrust

6. status: completed

If anyone could help me find it, I would be very grateful