Responses
it is the girl who jumped infront of boris's car and killed herself, boris felt so guilty about what happened to her and for not doing anything to save her from those guys that he made sure to try to save Sehyun in the bar bathroom. if she had not died boris and sehyun would not have met so he is thankful to her, visits her grave and writes her letters
Okay, my guess was right, thank you!!!!
Pleaseeeee