Grandma Ye Shurou (Shaoqing Wu) from Chaoshan lived a simple life, enjoying her twilight years. Her grandson, Xiaowei (Runqi Zheng), burdened by debt, secretly traveled to Thailand to find his rumored billionaire grandfather, Zheng Musheng (Yantong Wang). However, Xiaowei returned with shocking news: his grandfather was long gone, and the person with whom Grandma had exchanged love letters was a complete stranger. As Xiaowei investigated, a love affair hidden for half a century suddenly surfaced, striking Grandma's heart.