Question: what is 12 years promise about?
Answer: Synopsis. In 2002, on the night of Korea's momentous World Cup win, high school sweethearts Jang Guk (Lee So-yeon) and Yu Jun-su (Namkoong Min) sleep together and Jang Guk ends up pregnant. They are given permission to marry by Jun-su's father, but after a horrible accident Jang Guk loses the baby.