According to the query of water margin aid Korea, Song Wu walked hungry and thirsty and saw a hotel in front. At the door, he picked a flag and wrote five words: "Three bowls don't pass the post".

The words "three bowls, not just" mean:

1, indicating that the wine in the store is good, in order to attract customers.

2. advise people not to drink too much, otherwise it will spoil the broth.

3. Stimulate heavy drinkers to drink more, so as to sell more wine.

4. Advise the guests to drink too much before staying in the hotel.