The Memory of Me Being Reincarnated as an Enemy After Death

I died at the gunpoint of my enemy. After the gunshot, I did not go to hell or be reborn as a human being. I woke up in the deepest part of his mind and became a reverberation in his memory that should not exist. I couldn't touch him, couldn't kill him, couldn't even get a word out. But I can touch things in his memory. A bullet casing, a page of report, an ignored reflection. Just move half an inch and reality will crack open. Then, my killer began to doubt his own memory. The evidence at my trial began to contradict one another. And I will hide in his mind and cultivate this man who hates me the most into my revenge knife bit by bit! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.