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Se-hoon is a model student with good grades, but an unfortunate incident on the bus one day earns him the humiliating nickname of ‘Erector.’ The choir director, Won-dae, asks him to be his running mate for the upcoming student council election. Needing to rehabilitate his image, Se-hoon agrees, only to find out that he is Won-dae’s twelfth running mate. With his pride bruised, Se-hoon decides to join Sang-hyun, a walking luxury man known as the local social butterfly.