The Flowers Fall See the Fireflies

- FL tortured and killed by her husband and sister
- FL is reborn and seeks revenge
- Both FLs are strong, reserved, and cunning
- ML seems cold and aloof but he's actually gentle and sweet
- ML is older than FL
- Somewhat taboo romance (in TFFStF he's her ex-fiance's uncle while in RFTA he's pretending to be her uncle)
- Smart and cunning power couple

- Older man/younger woman
- ML is the emperor's brother
- Both MLs seem cold and aloof but are actually gentle and sweet
- ML has a chronic illness that FL helps cure
- Resourceful and cunning FL
- Power

Plots are different.