Yeh Xin is a beautiful girl who eagerly engaged herself in criminal psychology research. At the time, Yeh, Xin’s dad flew to the USA for a month, to attend a medical seminar. The mansion, due to a leakage was undergoing a renovation, which then parts of human bones were dug out from the garden! With the investigation going, she accidentally found within her boyfriend Lin Miao’s study room, hundreds of letters written to and from a pen pal named: “Bugzy”. With the suspicion of him cheating on her and the force of jealousy; she began reading the letters. Then not only to find, that other than “Xia, Zhihuan”, two other girls that were once important in his life: Yudy and MiChu also accidentally died, or committed suicide. Was it all murder? Or?