72 Seconds Heartbeat

Have you ever heard the heartbeat of time? Not a metaphor. It's a real heartbeat - one every 72 seconds, ringing deep in your ears. Sikong Shuo has been hearing this voice since he was a child. The doctor said it was tinnitus, so he just thought he was sick. Until one day, he converted an abnormal signal into audio in the laboratory—— What was heard was the breathing of three people. He checked the files. In the past three years, exactly three people have disappeared mysteriously. A pianist, a detective, a physicist. All have the surname Sikong. They all look exactly like him. He began to ask a very scary question: That heartbeat that rings every 72 seconds... Whose heart is beating?