<Chinese TV Series NOW> ”The Untamed” Episode 4, Episode 2, Wei Wuxian plays the Qingxin sound to prove that Jin Guangyao is the mastermind = Synopsis / Spoilers

※This article contains spoilers. In the Chinese TV series "The Untamed" 4 EP2, Wei Wuxian plays the Qingxin flute to prove that Jin Guangyao is the mastermind.
After successfully entering the secret room of Fangfei Palace, Wei Wuxian and Lan Wangji opened the box containing Nie Mingyu's head while everyone was watching. However,
Inside was a dagger, and while Jin Guangyao was explaining about it, his wife suddenly snatched the dagger and killed herself.
Jin Guangyao asked Wei Wuxian how he knew Nie Mingyu's head was there, but Wei Wuxian refused to answer,
Jin Guangyao drew his sword towards Wei Wuxian. In his haste, Wei Wuxian drew a sword that was nearby. However, that sword was Wei Wuxian's sword that Jin Guangyao had retrieved from the funeral granary after Wei Wuxian's death.
No one could draw the sword except for Wei Wuxian. With his true identity exposed, Wei Wuxian was about to leave the scene with Lan Wangji when Jin Ling stabbed Wei Wuxian in the stomach.
Lan Wangji barely escaped Jinlin Plateau with Wei Wuxian, who had been stabbed by Jin Ling, and decided to hide him in a quiet room in the Clouds of Faith. Wei Wuxian knew that Mo Xuanyu was in love with Jin Guangyao's wife at the time, but Jin Guangyao
He speculated that he had been banished because he had discovered Nie Mingyu's secret. He also thought that the person who had guided him to the location of Nie Mingyu's body might also know Jin Guangyao's secret.
When Lan Xichen asked Wei Wuxian for evidence that Jin Guangyao was the mastermind, Wei Wuxian claimed that Qing Xin Yin was involved. Lan Xichen laughed and told Jin Guangyao that Qing Xin Yin was the mastermind.
He said that he was the one who taught him. Wei Wuxian played the Qingxin Yin piece that Jin Guangyao had been playing for Lan Xichen, who confirmed that it was indeed Qingxin Yin. Even though Jin Guangyao had no need to learn this piece at the time,
He said that he had never tried it before, but after learning that it was extremely effective, he took the initiative to practice and master it.