In a little alley when they were eight, Shen Xingwan was a ray of light in Lu Yu’s bleak childhood. When they meet again in high school, she is a beautiful and talented ballerina from a prominent family, ranked second in her grade. He is a brilliant scholarship student from a poor family who takes the top spot by two points. From discussing problems in the library to sharing pear soup beneath the eaves on a rainy night, their young feelings quietly blossom as they spend time together. They bridge the vast divide between their backgrounds and make their relationship official amid cicadas and the scent of books, seeing each other through all of high school.
When graduation comes, Shen Xingwan heads overseas to study finance, while Lu Yu receives a place in a program to further his studies in a country renowned for scientific research. The thousands of miles between them become a chasm. Lu Yu is willing to give up the research he loves to follow her, but Shen Xingwan refuses to let him sacrifice his future for her. After every attempt to change her mind fails, she steels herself and breaks up with him, boarding a flight abroad alone and leaving Lu Yu behind with a first love that never had the chance to blossom.
Six years later, they unexpectedly meet again at a business summit. Shen Xingwan has returned home as a rising star in finance, still as dazzling as ever. Lu Yu has become a leading figure in cutting-edge research, and the mystery of his birth has been revealed: he was switched at birth and is the heir to a wealthy family. The regrets of the past have become an obsession. Seeing the occasional suitor by her side, Lu Yu is consumed by jealousy and can’t help pressing her at every turn, testing her again and again. When Shen Xingwan’s best friend makes a move on him, he pays her no attention, keeping his gaze fixed on the woman he has pined for over the past six years. Their old feelings have never faded. After misunderstandings and entanglements, Lu Yu will never let go again. He will keep the light that once brightened his youth by his side forever.