Rebirth: I Want to Lie Down and Don't Want to Work Overtime

A modern forensic doctor died suddenly after staying up late at night, and was reborn into the body of an ancient prisoner. He wanted to lie down and recuperate, but murder cases happened one after another. His hands were weak during the autopsy, his legs were weak after solving the case, and he was even regarded as a suspect by a female detective - this is a bad job. I don't want to work for a day!