It's difficult to express how disheartening this was; ultimately, no one found any satisfaction. I really appreciated the actors’ connection—IU and Joon Gi had wonderful chemistry, and that’s what drove my assessment. It seems like a follow-up might have been planned, given how the story concluded. The final scene felt unnecessarily cruel, dwelling on Hae Soo's recollections and amplifying its bleakness. Those responsible should feel bad about concluding things in such a depressing way.

Source on TMDB