"Can I also be a miracle for someone?" A repeat student, Young-ho, (played by Kang Ha-neul) has no particular dream and lives a repetitive boring life every day. He writes a letter to his old friend, So-yeon, but the letter was replied by her sister, So-hee (played by Chun Woo-hee). So-hee who is afraid of being found out asks Young-ho not to ask questions or to meet her. But Young-ho proposes to meet if it rains on December 31st....