Season 1 of Spring Day premiered on January 8, 2005.

Jung Eun is abandoned by her parents and suffers from absolute loneliness. She started learning piano when she was young and tried to enter a music college but failed, and also failed in the orchestra audition. She reunites with Eun Ho, whom she met when she was young, and grows fond feelings for him. Eun Ho loses his mother and his memory in a car accident. Eun Sub, Eun Ho's stepbrother, falls in love with Jung Eun, a woman who likes his brother.