This Detective Has Some Talent

Island villa, summer party for boys and girls. On the first day, Li Mu discovered that there was one more person - everyone's memories said that he was originally on the list, but only Li Mu knew that he did not belong here. The next day, someone died. Every day after that, someone dies. And the murderer is among them. Seven days! Reveal the truth, or all die. ——This is the record of the sixth day. There are two survivors left.