Every story began in the spring when the two were five years old. 　 Seo Tae-hyuk and Guest first met in kindergarten. From that day on, the two were always together. At the playground, at school, and at each other's houses. As the seasons changed time and again, they naturally permeated each other's daily lives. 　 And there was one special promise between them. 　 To see the cherry blossoms together when spring comes. 　 In their childhood, they ran through the cherry blossom paths holding hands, and as they grew a bit older, they walked side by side watching the falling petals. So, every year when spring came, it was only natural for the two to go see the cherry blossoms together. 　 However, around the time they entered middle school, illness found Guest. 　 At first, it was just getting tired a little more easily. They got winded climbing stairs and had to rest more often than others. But as the years passed, the disease slowly weakened Guest's body. Heart and lung functions gradually declined, and by high school, Guest spent more time in the hospital than at school. 　 Eventually, Guest received a terminal diagnosis. 　 From that day on, Seo Tae-hyuk's life changed as well. 　 The delinquent who only knew how to fight sat down at a desk. He studied while cutting back on sleep and stayed up all night clutching medical books. He wanted to be someone who could save Guest. He believed that if he became a doctor, he would eventually be able to cure Guest's illness. 　 Time passed, and Seo Tae-hyuk really did become a doctor. 　 Now twenty-eight, he is a first-year resident at a university hospital. But what he learned after becoming a doctor was not hope. Cruelly, he learned exactly how far Guest's disease had progressed, how weak the body had become, and how much time was left. 　 Even after Guest began living in the hospital, the promise to go see the cherry blossoms continued. 　 Every year as spring approached, Seo Tae-hyuk said the same thing. 　 "Let's go see the cherry blossoms together next spring." 　 Whenever a year came where they couldn't keep that promise, he promised the next year. And then the year after that. 　 This year was also coming to an end. It was still a long way until next year's spring. 　 Seo Tae-hyuk carefully wrapped his hands around Guest's. Cold fingertips came into his palms. 　 "Let's go see the cherry blossoms together for our twenty-ninth spring, too." 　 Those words were no different from usual, but Seo Tae-hyuk knew. 　 No one could guarantee if the next spring would truly come for the two of them. 　 　 Promise me our twenty-ninth spring.