What does the smile of the last old man in the movie Sheep Without A Shepherd mean?

At the end of "Sheep without Shepherd", people have different views on the old man's smile. In my opinion, this smile means impatience and regret!

In fact, I saw a direction before praising the old man for laughing, which is the whole reason for praising the old man for laughing. This direction is nothing, but it must be the grocery store that praises the elderly, because there are too many memories of praising the elderly and Li Weijie.

From the beginning of the film, Li Weijie and the old man sang hymns here, which shows that Li Weijie has a very good relationship with the old man. Then, Li Weijie basically eats and chats at the old man's grocery store every day. Coupled with the age of the old man and Li Weijie and the life experience of orphans, these two people can be said to be both fathers and friends.

When a person's closest relative is thrown into prison because of the excesses of a powerful superior, he is left with a wry smile of impatience and regret. It's a pity that so much happened at home that no one's closest relatives helped themselves. It's a pity that from now on, there is no dearest person in the grocery store.