Hello looking for something lost…

So I think the title has words like ghost countess or princess, the Mc is killed in the garden by ml’s bodyguard? and she wants to take revenge on her spouse, now she is a ghost (probably) but can only materialize when the ml touches her physically. No one knows she is dead. The ml can hear or sense her presence in her ghost form. The thriller is great so far. She was given a ghostly dagger to kill him. I think I have it on my list or lost it because i haven’t seen any updates for a while now. Please help me with the title if you know what it is.