It means that a prisoner had a sum of money hidden. When he was in prison, the prison guard knew about his money. When the prisoner got out of prison, he went to the prison guard to get the money back. He found that the prison guard was blind. The prison guard and his wife opened a coffee shop. The prisoner pretended not to know the prison guard and worked in his shop. He cheated with his wife to make her try to kill the prison guard and then fly away together. As a result, the death of the prison guard was not the man's death, and his wife was warned that the man would eat black. But at the end, she got into a taxi, and the driver was the man's cellmate (implying that she would be blacked out in the end). There were two large-scale dramas, one in which the man helped the woman climb the stairs and the other in the garage.