In the Western Han Dynasty (西汉时期), there is a boy named Kuang Heng . He is born in a poor family so he doesn't have enough money to go to school.

Kuang Heng likes reading books very much. But he has to work during the day and can only read books during the night. The only problem is that he has no money to buy a candle. So it often takes him half a month to finish reading a book. He always feels sad and blue. 

One day, he finds that his neighbor has candles, But the man lives next to his house and the light from the candles can't go through his wall. Suddenly, an idea comes to him. "I can make a hole (洞) on the wall so that the light from my neighbor's house can come to mine," he says to himself.

From that day on, Kuang Heng reads books every night until the light goes out (熄灭) . Finally, he becomes a great scholar (学者) .