The sweet hawking sound sounded at the hot noon, mixed with the noise of cicadas, like a clear spring, making people feel a sense of comfort. With the hawking sound, there was also a clang and clang. The sound of the wheels rolling over the ground. A trolley filled with lunch boxes appeared in this area of office buildings. A man and a woman pushed the cart slowly, and the woman was holding a child who looked six years old in her hand.