Grandma Ye Shurou from Chaoshan lived a simple life, enjoying her twilight years. Her grandson, Xiaowei, burdened by debt, secretly traveled to Thailand to find his rumored billionaire grandfather, Zheng Musheng. 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.