Two skilled swimmers, one a school ace and the other a silver medalist, secretly meet at a pool to improve their swimming together. After practicing diving, they move on to kickboard swimming despite teasing about its childishness. Their private sessions catch the attention of Sung Yubin, the pool manager, who surprises them by asking to join their secret practice group. Though reluctant, they agree to keep the arrangement among the three and consider grabbing a beer afterward. The episode ends with the trio preparing for another swim, leaving the future of their unusual training pact open.