Society Game 4th story. At last, Nopdong escaped from the losing streak and got the first victory! However, the joy of victory is temporary, and once again, Kim Hee Joon begins to move for leadership succession, and Madong's Sang Guk, who tries to keep his position as a leader from the rebellion, begins to endless conflict and the temptation of betrayal. "Resident Exchange", the largest event in the Circular village that will shake the plate of power, only one villager can change the village from each village! Great chance to change your fate! Who will go to a new village? The fourth challenge is "Bottom Subtraction", both teams select 6 people to climb on top of 100 square blocks, and the corresponding residents climb on the block. The rest of the residents look at the open number plate and find multiplication formula, both teams alternately with a 10 second time limit. If you say a wrong answer or exceed the time limit, it will be treated as an incorrect answer, and blocks will be removed as many as the number of incorrect answers. The village that lasts longer on the blocks wins! Which team will win? Who will be the fourth dropout that will leave the village where betrayal and alliance are raging? (Source: TVING)