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Lu Xing has a habit where she takes a day off every month on the 16th.
By taking a day off, she means entirely cutting off any contact with the outside world. It's as if she evaporates from the face of the earth, with no one aware of her whereabouts or able to reach her.
So, on this day of each month, unless it's absolutely unavoidable, she would arrange for her assistant to accompany Chen Enci to fulfill her obligations. Otherwise, she'd ensure that Chen Enci stays at home, minding her own business.
As it happens, today is the 16th. So, when Lu Xing heard about Chen Enci's plan for the evening, without a second thought, she refused. "No way, Enci. You cannot go."