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Anyway, here's the gist of it. A certain cunning Korean student, Lee, wanted to get rich but didn't know how to do it quickly. No matter what he tried, nothing brought in any profit. Then one day this summer, which was incredibly hot in Korea, as in other parts of the northern hemisphere of our unfortunate planet, this Lee got thoroughly fried while trudging down the street, still pondering how to ride the golden calf. At that moment, Lee suddenly found himself under the shade of one of the sprawling trees growing along the streets of Seoul. The tree's shade significantly improved Lee's physical condition, and his thoughts immediately became clearer and sharper. "What if?" Lee immediately realized, and rushed home to implement the idea that had suddenly occurred to him. So, a student named Lee, languishing in the heat and penniless, created a mobile app that shows city dwellers the most convenient route for getting around the city in the intense heat, recommending only those paths with shade. The app immediately became popular, and Lee, delighted, began to earn money. So there you have it, the answer to the question: How to get rich on shadows?