Sister-in-Law, You Want Me to Impersonate the Jieyuan?

After transmigrating, my sister-in-law actually wants me to impersonate my brother, the Jieyuan? Shen Yi, now a fake son of the Duke of Ning, just wants to live a leisurely life fishing, drinking tea, and listening to music. But who would have thought this chaotic world and turbulent court would force him to step into the game and strive for glory!