I Promise You 7 Days to the Nth Power Again

In seven days, I walked through the streets and alleys of the holy land of Lhasa, from the warm sunshine to the cold wind, from the flowers blooming all over the place to the withered leaves, from being together to being apart. It turned out that it was a gamble between him and her, and they used it as chips. In the end, he lost and she cried. However, he was still willing to promise her seven days a thousand times more, and this time, it was a journey of deep affection.