Confession of Murderer is a thrilling action film turning around Lee Doo Suk - a serial murderer. After the expiry of invesstigating the case, he publishes an autobiography describing all his murders in detailed. However, detecctive Choi who handling the Lee Doo Suk’s murders 15 years ago is always suspect Lee Doo Suk. Meanwhile, another murderer appears that makes detective Choi thinking about the doubt on Lee Doo Suk. Who is the real murderer?.