Chapter 1: Hey!! here's my review for this story.
Plot wise it was very good. I liked how it started with him singing the song and getting lost in his memories and ended with him finishing the song. It was a very good touch and felt satisfying. The story was very sad though but believable. From my knowledge about mental illnesses (well first because I myself have some problems and second because I want to help people) I have learned that a lot of people who do commit suicide have cases like the main character, because they have to have a strong resolve they don't find it necessary to seek attention or tell someone, which is very dangerous. Ahh I feel like I'm rambling but The story was very poignant so plot wise you have done a good job.
Grammar wise- I would suggest you edit the story one more time or maybe find a beta who would do it for you.but it's not super bad or anything it just needs tweaking here and there. one more thing, I see that you have used different fonts and sizes, is it intentional?? if not I would make it the same size and font lol. also I feel like the separations isn't really necessary because you clearly indicate how much time has passed in the beginning of each paragraph. I think that is it!
I really liked the story overall it was very thought provoking and you have done a wonderful job characterizing the main character. as some people say "the saddest people smile the brightest"
I hope you continue writing!
Sunchild

Chapter 1: Omg , the story is so beautiful even though it was really short , it showed a lot . I really like it the part when he readed her letter where she showed him the steps , I felt like she wanted to make him happy even though she was sad and mybe because it made me happy , because I really hate sad things XD . Anyways it is amazing ! Also I really love Jin cover of ' I love you ' too TT , it has so many feeling and Jin voice is just so amazing .

Chapter 1: This story made tear up a bit. Do you need a beta?