C24 Curiosity

"Cheng Dang, who's come to our house? I heard the doorbell ring." Cheng Wan and Tang MengBing were having fun together, but were interrupted by Tang MengBing in a bad mood.

"You misheard me. How could I hear the doorbell? Don't worry about it anymore, let's continue."

"I really heard it." Tang MengBing stopped him and strained her ears for Cheng Dang to listen. Sure enough