The man in the classic sentence "Bai Yexing" is Kirihara Ryouji. The most classic line in the movie "Night Walk" is what the protagonist Kirihara Ryouji said before he died: "When the sun rises to the highest point, the shadow disappears." Therefore, Kirihara Ryouji is the hero of the classic poem Bai Yexing. Nocturnal Walking is a novel created by Japanese writer Keigo Higashino, and it is also his masterpiece.