The strongest mercenary

This is the real experience of several Chinese who joined the "black-blooded" mercenaries. They are a group of people chasing war for money, walking on almost every battlefield on earth. They fought bravely and took risks, but never retreated. Killing is just a way for them to make money, and the rescue of hostages is just to earn commissions. They are caught in a huge conspiracy and in the fog. Can they solve the crisis and take revenge successfully? How should he choose in the face of survival and death? Who is the traitor? Why did he take this road of no return?