Jong Beom, the stylish captain of the 'Piggy Back ferry' in the port of Busan, struggles every day to protect his beloved family from his immature younger brother's sudden marriage announcement, his son's first love, and friendship with his friends. One day, his alter ego and son No Ma was on the verge of losing something mother-like that he can't live without, the 'Piggy Back ferry'. In May, the family month, 'Piggy Back' which will bring joyous laughter and tearful tears is coming.