In the play The Light of Nirvana, Miao Yin is the real messenger of Nirvana, who undertakes the important mission of protecting the Kuroha family. Only the light of nirvana can save the world, and he decided to be the murderer of the play at all costs to protect the Kuroha family. As the emissary of Nirvana, Miao Yin has special ability and mission to ensure the safety of the Kuroha family. In order to achieve this goal, we have to take some immoral or extreme actions, including becoming the murderer in the script. This is to confuse people and protect the true identity and secrets of the Kuroha family.