Bulletproof troops followed two police officers, Bishop and Park, in pursuit of repeat offenders in the East End of London. On the surface, Bishop and Parker have many similarities - their calm, intelligent, unapologetic street wisdom and toughness; They have a deep brotherhood and will always be together. However, they come from very different backgrounds, and their personal motivations and emotional lives outside the police force are also different as a result: Parker is an ambitious family man, the son of a decorated police officer, determined to follow his father's footsteps, but not in his father's shadow. Bishop grew up in a nursing home and on the streets, never knowing his father. Despite these differences, Bishop and Parker still share the same moral principles, and even if their chemical reactions appear to be about to erupt, they can cooperate well.