It could indicate that the love story has a high level of popularity or critical acclaim on IMDb, perhaps due to its compelling plot and strong performances.
I don't have the IMDb rating of that movie off the top of my head. But a quick search on IMDb will give you the rating and also reviews that can give you a better idea of what people think about it.
Well, it can vary depending on different users' opinions. But to know the specific rating, you should visit IMDb and see for yourself. Maybe it got a high score for its touching plot and good acting.
The plot could revolve around the unique challenges and beauty of love in winter. For example, the characters might have to overcome the cold and the short days, while also enjoying things like ice skating together and warm evenings by the fireplace. It could be a story of how their love grows stronger as they face the elements and other obstacles during this cold season.