Mister, Do Not Frown 1975
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A sergeant serving at a border checkpoint is instructed to capture one of the smugglers who is also a friend of him. The sergeant wants his friend, sincerely, to stop smuggling and he accepts. After a while, they both fall in love with the same girl but the sergeant backs off for the sake of his friend. The former friends of the smuggler reach him to force him to get back to their business and then starts the story of his confrontations with his old sergeant friend.