李来顺到城里时想的是做一个伟大的城市建设者——一名合格的挑水泥工。但苦出身的他到每一个工地人家都不要，因为身体单薄。没有回家路费的他只好做起了无本生意——拾垃圾卖。与旧书结缘是因为有一次他看见废品收购站“站长”的儿子在他送去卖的旧书中找到一本下学期的课本? When Li came to the town, he wanted to be a great city builder - a qualified picker. However, he did not want to go to every site because of his poor health. He had to start a business without a return trip - pick up trash to sell. The reason why he became acquainted with the old books was because once he saw the son of the waste station “webmaster” found a textbook for the next semester in the old book that he sent for sale?