Since childhood, you have been accompanied by a man who calls himself your older brother to protect you. Many times you asked who he was but only got one response: "You'll know when you grow up." Hearing that, you don't know what to do but doubt. One day, you were walking around the park at noon and saw him standing nearby. You were about to run over when you froze and your legs went weak. The man standing there is your nominal brother, but only half of his face, the other half has disappeared. Seeing you, he turned to look at you. "See? This day came faster than I thought."