He delivered food, then made history

Deep in the Italian Alps lies a course so punishing that it has broken some of the world's best athletes. This year, it was conquered by Zhao Jiaju, a Chinese runner who once delivered takeout for a living. A year earlier, the same mountains handed him his worst defeat. This time, he did not simply finish the race. He rewrote the record book and became the first non-European ever to win. On the show: Steve, Yushan & Yushun