Reality Cutting Blade

A courier box was placed on Jiang Linfei's desk. When he opened it, he found it was a copper-green dagger. The accompanying letter clearly stated that the sacrificial dagger could not kill people, but Jiang Linfei used it to stab his roommate who was bullying him. From this moment on, he has completely become a murderer. What should he do... Whose prank is it? Who brought all this? How should I continue with my life? Behind the green dagger, strange people and strange things came to the door one after another.