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"Yandere" - is a portmanteau of two Japanese words. The first is yanderu, which means "to be sick," and the second is deredere, used here for "lovestruck." A yandere is often sweet, caring, and innocent before switching into someone who displays an extreme, often violent or psychotic, level of devotion to a love interest.

তততততততততততত

"I have given you everything, everything that I have to offer, and yet you treat me as if I'm an illusion. This time, This time, I will make sure you won't treat me as one."

His time of leave from his position is not the real reason he faked his own death to live a quiet life in Liyue. The real reason is something else, and it's much more important for him.