By the Su Causeway in the Jiangnan region, a woman inherits her ancestors' entrustment and stays to guard the old site. As streams of tourists pass by, she has witnessed countless gatherings and partings, and always abides by her promise and refuses to leave. In the spring glow of each passing year, she holds fast to the promise hidden in her heart, waiting for old matters to reach a conclusion, waiting for the long-overdue answer.