The play is about a detective doctor who appears when "death is not a natural phenomenon but a man-made factor, and it is not an after-treatment but a pre-prevention." It will reveal the truth about industrial disasters, man-made environmental disasters, and occupational diseases that have unlimited impacts regardless of reason or object. Park Jin-hee will play Do Jong-eun in the play. She is a specialist in occupational environmental medicine. She never smiles except when she is with her daughter. Although she is only 38 years old, she always has an expression like she has experienced a complete life in her 70s or 80s. She is a genius occupational environmental medicine specialist with amazing concentration, but her talents are not all innate. Bong Tae-kyu plays the role of "soy sauce man" doctor Heo Min-ki in the play. He is a man who wears branded clothes from head to toe and drives a yellow convertible Mercedes. Because of the cruel and suspicious death of his father 16 years ago, he has always dreamed of revenge.