The Yandere Male Protagonist Eavesdropped on My Thoughts

The yandere male protagonist makes him cry every day. In his previous life, Gu Ling was a cold-blooded and inhumane killer who killed all the male protagonist Li Yao's relatives. Gu Ling killed the entire world in bloodshed. Except for the protagonist group, everyone who appeared was killed by Gu Ling. But Gu Ling was reborn, and some system appeared. It is said that this is a novel world. There are characters who develop obsessions at the end and must eliminate their obsessions before they can escape from society and be reincarnated. But why is this little kid crying? Why do you always pester her and call her sister? Why does it seem like something is wrong...