In police criminal affairs detachment of Dinghai City, Ouyang Wen, Lu Cheng and Ma Chao are good friends. However, their friendship undergoes severe crises because of a pair of long lost tiger-shaped tallies which can trace back to the Spring and Autumn Period. Misunderstandings, betrayal and the friendship among them bring unexpected changes to their lives. When the pair of tiger-shaped tallies is finally retrieved and secured, blood has stained their youth in the battle of justice and love.