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A year ago, He Yi'an unexpectedly came to the little-known winter paradise - "Shangmo Qingju". In just three days, he met a person who was very similar to his long-dead sister He Yixi - Mo Qingxue. When he left, he made a winter pact with her. After returning to the city to celebrate the New Year, He Yi'an unexpectedly discovered that some of the people he met in "Shangmo Qingju" died a month after he left. The next winter, He Yi'an went up the mountain again, but experienced incredible things, and also discovered the ignorant past and conspiracies in "Shangmo Qingju"...

I, who have a Möbius strip composed of the fate of the sun and the chance of comets, have a magical love relationship with Su Xiaoran, a patient with depression.