Their first meeting was on a snowy day,
The day she decided to fall in love with him was also a snowy day,
It was also snowing on the day he killed her whole family.
The day she decided she no longer loved him was also a snowy day,
······
The pure white snow witnessed that their relationship was not pure. She helped him while he killed her family; she loved him and he embraced other women; when her scarred heart could no longer withstand the torment, when she finally decided to have a trace of warmth, he suppressed the only "warmth" in her heart and forced her to return to him again in a snowy weather.
A lost heart is lost and can never be found again.
The two of them seemed to have entered a maze, wandering around in it for the rest of their lives and never getting out again.