The Great Trickster.

Summary

In a police dog unit, most cleaners are from a third-party company, except for a university student named Zhang, who is treated poorly. Despite the rain, he rushes to care for the dogs, earning sympathy from older cleaners. A young man arrives seeking Zhang, who is known for calming the dogs. He discovers Zhang's unique bond with the animals and his unexpected expertise in training them, despite being a janitor. Zhang explains his dedication to the dogs and the knowledge he has gained over years, emphasizing that one's worth isn't defined by their job title. The young man is impressed by Zhang's abilities and the loyalty of the police dogs.

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