The white part of the room could symbolize innocence or goodness. For example, if it's a story about a person's moral journey, the white room might be where the person's positive thoughts and actions originate. The black part might signify mystery or danger. It could be where the person faces their fears or the source of evil in the story.
In the light novel, Ayanokoji is clearly the more intelligent one. He has a unique ability to analyze situations and people's motives deeply. Ryuen often falls into Ayanokoji's traps because he doesn't fully understand Ayanokoji's true nature. Ayanokoji can anticipate Ryuen's moves and counter them effectively, while Ryuen struggles to keep up with Ayanokoji's complex thinking.
When Ayanokoji says 'I'll use any means necessary to achieve my goal', it reveals his somewhat ruthless side. He is not bound by conventional moralities when it comes to reaching his objectives. In the light novel, this could be a result of the cut - throat environment he is in. However, it also makes him a complex character as readers are left to question whether his actions are justifiable or not.
Xu Shi Sheng Bai was a Chinese idiom. It meant that if one's heart was free of any distracting thoughts, one would be able to comprehend the Dao and gain wisdom. It was also often used to describe a clear and bright realm. This idiom came from Zhuangzi's Human World. To be specific, the empty room referred to the heart, and the white referred to the state of enlightenment and wisdom. When a cultivator closed his eyes to cultivate, he would reach a state of emptiness and whiteness. When he closed his eyes, he would no longer see darkness, but colorful light. This idiom could also be used to describe a state of pure and clear mind.
I'm not sure which specific 'white and black room story' you are referring to. There could be various stories with this setting. It could be a story about a person trapped in a room that is half white and half black, experiencing different emotions or events in each part.
One of the notable quotes by Ayanokoji from the light novel could be 'I don't care about victory or defeat. What I want is absolute control.' This shows his unique mindset that is not focused on the typical goals of winning or losing but rather on having power and control over situations.