This sentence came from the Tang Dynasty poet Bai Juyi's "Farewell to the Ancient Grass." The whole sentence is: "After thousands of calls, I still hold the pipa and cover my face." He came out after a thousand calls, still holding his pipa and half covering his face. This sentence was used to describe a person who didn't show up easily or was unwilling to show himself completely but adopted a half-hearted attitude. It could also be understood as a tactful rejection or an attitude that did not want to reveal too much of his inner feelings.