Lord of the Afterlife

My name is Yang Ming, a desperate person The heartless world understood all my reasons for living, so I committed suicide. However, I am still alive... I could run and jump, and the only thing that became weird was the world in front of me. Because they, no, it should be them. People I shouldn't have seen appear in this world... Who are they? This is both familiar to me and incredible to me. They are people, but they are dead. Common name: ghost