It is said that "All-Service House" accepts any task, whether it's walking dogs, finding cats, or… even stabbing people. Da Hei reluctantly takes on these odd jobs to earn medical funds, unaware that his roommate Xiao Bai is secretly an operative sent by the intelligence agency to take them down. After completing mission after mission, the two rookies' growing dependence on each other deepens each day. But can they be together? Will they choose to reform their ways or continue down the dark path?