C89 Fluttering petals

"Is this thing reliable?" Zhou Heng was a little doubtful in his heart.

Now he was walking around the city with a glass of water in his hand, and there was a plum blossom stuck in the water.

This was the "Winter Plum Blossom Tracking Technique" that he had learned from the Art of Pursuing. The main idea was that as long as he kept thinking about the person he was looking for