In an impoverished environment, Park Geon, who grew up as an excellent capitalist dog, suffers humiliation from a mysterious man while engaging in backroom dealings in billiards. Nursing his wounded pride, Park Geon decides to carry out an assassination mission, his main source of income, and infiltrates a casino. There, upon completing the mission, he unexpectedly reunites with the same mysterious man who had humiliated him. However, this time, instead of a billiards cue, Park Geon finds himself facing a gun and is easily subdued. To survive cunningly, he ends up making a proposal...