Practicing Qigong in the Underground City

When Asi was ten years old, he fell seriously ill. He was feverish all over and fell into a coma. He saw a doctor and took medicine, but there was still no improvement. Later, another old monk passed by and went to treat his illness. He just gave his parents a black pebble and told them to put the stone next to the boy and must carry it with them within five years. Later, with the black pebble, the boy recovered his health. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.