ecoute chérie

(Trying my best to include whatever details I can remember, and I think there were 2 or 3 parts to it) Where reader & him were friends ever since they were little as their mothers are friends. And Jungkook falls in love with the reader's elder sister so their friendship falls apart, and Jungkook in the end marries her elder sister and has kids with her. Then the reader sends him her diary which details how she felt watching him fall for her elder sister ever since they were little. She also becomes engaged to Jimin I believe, who is a dermatologist and she grew up to be a marriage/couple counsel. I always thought it's called "The Time I Gave You" but Google gave me nothing so I hope for the best someone on here knows what I am looking for.