I Really Didn't Kill the Person

When Meng Min woke up, he found five roommates scratching their throats with their nails in their sleep... Qin Tian: Did you kill the person? Meng Min: It's really not me. Qin Tian: You were the only one who survived last night, and the surveillance did not detect anyone else entering the dormitory. Who else was it not you? Meng Min: They committed suicide. I saw them tearing blood vessels with their fingernails. Qin Tian: Do you think I am a three-year-old child? Would anyone commit suicide this way? Meng Min: If you had to find a murderer, it would definitely be... … Meng Min rolled up his sleeves. The strange jade bracelet on his left wrist kept shrinking and getting tighter, but he couldn't take it off no matter what. Until a strange phone call came late at night...