In recent years, the top four people in the underworld of City Z had been fighting both openly and secretly. They all wanted to destroy each other and make their power grew bigger. They even wanted to monopolize! The peak of the conflict broke out in February this year. An explosion happened at a massage hotel under Yan Baohua. It was reported that the underground gas pipeline of the hotel had leaked and an accidental explosion had occurred, causing many employees to die. It was an accident.