A self-abased fat boy and a wash-up national swimmer, one longing for love and the other struggling to retain past glory. How will they inspire each other and head for a better life?

一個自卑的胖子和過氣的游泳國手，為了各自的生存和慾望，開啟了一段意外的游泳課程，他們如何在一個名為「大海洋」的小泳池裡互相激盪、突破困境，「泳」往直前。