Personality Transformation in the End Times

The protagonist has a split personality. Before being reborn, the kind and emotional host personality was killed, and after being reborn, the personality was missing. The purely rational personality went online with a bunch of crazy personalities. He embarks on a path of revenge, destroying the world along the way, and becoming the king. However, this is interrupted by a sudden death, and an unknown person is recruited. The top opens and the top attacks the side of the bed. The top says, "What d