When two previously divorced people get married and raise their children together, they name their children after the golden period of life, hwang-geum-ki, hoping that their children will reach this period in life sooner than they did. They have no idea what their children will have to go through before reaching hwang-geum-ki, however. Lee Hwang, the eldest daughter, has been married for five years with a daughter and a successful career, but underneath she is anything but happy. When she runs into an old flame, she embarks on a reckless path. Lee Geum, the second daughter, has chronic myelogenous leukemia, a serious condition which constantly takes a toll on her life and happiness. Bright and cheerful, however, she pours her energy into her job as a track team coach, while secretly trying to repay her birth father's hospital bills. Lee Ki, the youngest son, successfully graduated from med school and became an intern at a hospital, but his real dream is to become a musical actor. When he quits the hospital in order to take dance lessons, he must hide it from the rest of his family while dealing with his sisters' issues. Enter Go Kyung Woo, a TV producer at a major network whose success has made him arrogantly indifferent to the troubles of others. When he and Lee Geum meet, sparks fly but can he learn to care about her, especially with her disease? Lee Ki, meanwhile, has another problem - he just might be falling in love with his sister-in-law...