Chapter 1: That starred sentence was a personal note from you, author, right? If so, then I'm sorry you had to go through such heartbreak. It's clear that relationship meant a great deal to you :(
I can't say I know how it feels - not because I'm in a perfect-happy-all-rainbows-and-unicorns relationship. Simply because I've never been in a relationship to begin with. But if I ever do, and probably will, get into a break-up; then I think I would remember this story and come back to it to find comfort in your words.

So thank you for writing this, and (I think) sharing your experiences with all of us.
If not, and this story does turn out to be pure fiction, then... that's a bit awkward haha. But the writing is still amazing and I'll be awestruck about how you thought all of it up. I particularly liked the jigsaw puzzle metaphor - that was really well done. And the little formatting you did at the very end was nice :)

Chapter 1: For some reason this feels less like Moonbyul dumped her and more like she died. The whole thing with the piano, which I guess(?) Yongsun still has, makes it feel like a tragedy beyond heartbreak.

Chapter 1: What a great read here. Beautifully written. Reading Yongsun's letters to herself feels like I'm intruding on her privacy, because she wrote everything from the bottom of her heart. It feels highly intimate. I could relate to what she was saying, like this line here: 'there's so much chaos strewn all over my mind, but when i arrive at a fresh page, i can't seem to pen anything down'. It's definitely hard to start writing the first few words because it's so hard to organise your thoughts. I like how Yongsun wasn't just writing about Byul; she also gave herself assurance and encouragement, and I would think in doing so yourself, it gives you a greater sense of empowerment as compared to someone else telling you to do so. The paragraph which starts with 'i make a trip to the mall(...)' hits me quite hard because of the run-on sentences. I could really feel the frustrations and anger that Yongsun felt as well as this sense of hopelessness. I like how as we read through all the letters we can feel the shift in Yongsun's emotions, where she gradually accepted herself and what she's still feeling for Byul. It's true that one does not simply delete memories. I also like the use of metaphor and imagery by Yongsun; it seems like that's the best way she could describe what she's feeling. The ending is a beautiful one. She's slowly but surely healing, and it must be liberating for her to write these letters to herself and at the end, even having the hope that these letters will end. Great use of stylistics at the end where the word 'blank' is placed on another line. There's a sense of closure with Yongsun writing her letter that way. Thank you very much for this.

Chapter 1: I love the anologies. Getting your heart broken is never easy. Thank you for this.

Chapter 1: My heart ached at the beginning. Towards the end, I felt a sense of relief? Like I imagine writing everything down must have felt therapeutic. I appreciate how realistic this was. Makes me feel like I should start journaling to help sort out my feelings and thoughts.

Chapter 1: oh my gosh i love this