Wang Mingzheng was muttering to himself when a fifteen or sixteen-year-old walked towards him. He carried a backpack and had a pair of endearing dimples on his face, radiating youthful energy yet carrying an air of detachment.,Of course, this was just a small song Wang Ming sang on his way home from work. Wang Ming didn't take it seriously and continued walking through the still-hot evening sun towards a famous slum in Xi District of City A.,Suddenly, Wang Ming's smile stopped abruptly. His brow furrowed, and doubt clouded his face.。