https://www.asianfanfics.com/story/view/1371360/i-loved-you-first

Description 

it has been a year since the accident happened to Kang Seulgi. She developed a critical case of selective amnesia for people and memories with them. Unfortunately, the forgetfulness spanned from when she was in high school up to her accident. Will she remember that one person who claims to have loved her first? 
 

hi!!! I realised I've been spoiling the sprites and neglecting the serenitys here hehe oops.. anyways, this is a nice story inspired the author's own love life I suppose,, quite a lot of plot twists too so if u don't think u can keep up...um...... 

im quite happy with the ending. Irene made mistakes. Grave ones but we can see in the story that she has done her best to make amendments. Seulgi changed, character-wise, from a player to a committed lover, but encountered struggles and challenges. I'm glad that Seulgi was not a revengeful person but instead chose a rational and (super duper cute last sceneeee) sweet way to help them both achieve a second chance. To be forgiven. To forget. And to love:)
 

side notes- seulgi gets into car accidents here so just in case: trigger warning !