One Pluck, One Death; the Guqin's Deadly Melody

As I played the guqin in the coffee shop, I saw my fiancée and my brother whispering sweet nothings to each other. Her slender fingers were picking up a piece of cake and gently feeding it to my brother. He licked his lips and then kissed her fingertips. They smiled at each other, their eyes sparkling with a familiar emotion. "Next piece, 'Guangling San'," I whispered expressionlessly into the microphone, my fingers lightly caressing the guqin strings. Ten meters away, in a corner, my fiancée, Lin Yuhan, was nestled beside my brother, Su Mingxuan. My parents sat opposite, beaming with joy. Wait, weren't my parents supposed to be going to Yun...