Three people down the escalator to the mall on the third floor, this floor is the clothing section, CAI teacher ready to buy a new pair of shoes. She walked into a random store, checked the sign, and changed into a pair of relatively inexpensive sneakers. She was about to pay, but see Yin Caiyu smile Yang Yang invoice. "Teacher, I paid!" "Oh, no, no! I can't let you pay! ' The teacher quickly waved his hand. Yin Caiyu smiled and held the teacher's hand: "Just a pair of shoes, d...