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Logically speaking, the customer had to notify the host before he left. However, Cheng Da was too drunk from drinking yesterday and still hadn't woken up yet. On the contrary, Lin Su was the first to wake up, so it wasn't good for him to go and nag him.
With Su Zhirou staying at Cheng Da's place, Lin Su was also more at ease and focused on looking for Flood Refining Grass