My Romantic Fate with My Own Past Lives

This looks pretty satisfying. The male and female leads are decisive killers, with normal intelligence and no especially obnoxious traits.

This is a fairly traditional cultivation novel. A self-insert romance.

In this life, no one can ever truly feel what another person feels. Perhaps they can sympathize, but they can never understand why someone hesitates to speak, or the unspoken pain and wounds in their heart, nor how badly those wounds have festered. That is everyone's sorrow. But if it were your own, you would know the pain in your heart that others cannot understand.