As someone who has watched the original or the Chinese film in the same title which was basis of this remake, the key difference I have seen was it was more intimate in portraying their friendship as it gave more platonic aspects. Also, the timeline in their lives were more established and clearer in the Chinese film rather than the Korean remake that's why some were confused what happened when Misoo and Haeun were apart or what's the real story from the blog site and on what truly happened.

Nonetheless, the emotions even the ending was there which was not far from the original. Still, I highly recommend that you watch the Chinese film since it was more dramatic from how different the two women lives were and how their bond remained strong over the years. I know some of you will say that the remake could make itself different from the original, however, the Chinese film was so good that I can't help but to compare them.