She and Mo Xiuchen have known each other for as many years as her cousin, and he actually claimed that he didn't even know what she liked to eat.
Moreover, earlier, when he said "If Ranran doesn't mind, then I don't mind", it indicated another clear implication.
Looking again at his interaction with Wen Ran, although it was just the simplest instruction, it showed that their relationship was good. Otherwise, with Mo Xiuchen's character, he wouldn't take an order from a woman.
She suddenly felt that she shouldn't have decided to come in and say hello just because she saw them sitting by the window as she passed by. Even so, she still put her thought into action.
Although Mo Xiuchen didn't say he didn't welcome her, it was obvious that he didn't want anyone to disturb his alone time with Wen Ran.
