A poor nursing student, Ethan, abandons his exam that he prepared for three years to save an elderly man collapsed in a storm. That elderly man was the father of the person Ethan's father saved with his life in war 20 years ago, revealing a destined connection across generations. Inheriting his father's spirit of sacrifice, Ethan becomes a true nurse, and the blue scarf becomes an eternal symbol of how good deeds circulate and save lives.