The Snow That Does Not Melt 1

The three people went through all kinds of things and formed a deep friendship, but in the end Xueer, Shiyu and Lanzi were separated by Yin and Yang. Once when it snowed, a butterfly flew over, and there were faint tears in Shiyu and Lanzi's eyes... When the snow fell on Lanzi's hands and did not melt after a long time, Lanzi's tears fell silently...