IU wrote a total of four songs for Sulli.
2012 - Peach 복숭아
{ A song IU wrote for Sulli from the pov of a man }
Telling you multiple times is not enough
With this tickling voice
That only knows you
I will sing for you
My heart keeps going to you
2015 - Red Queen
{ Sulli left f(x) in August 2015. In Oct 2015, IU released the album Chat-shire, containing "Red Queen", a jazzy song containing the story of an equally hated and loved Queen. }
Everybody fell for her, fell in love with her
Her laugh was that beautiful
Wearing a gala dress, innocently chatting
That pale, dried up cheek
Used to be full of life
Oh red queen
2019 - Love Poem
{ IU releases Love Poem on November 18, 2019. I'll let the snippet of lyrics below tell the story of this song. }
I think I can softly hear
A love poem that was silently written
It clearly flies over to you
I hope it reaches you before it's too late
I'll be there, behind you when you walk alone
Singing till the end, this song that won't end
2020 - Eight
{ Released today. May 6, 2020. A bright song with a bright melody about a sad story. A sad story from a chapter that the songwriter is ready to close, and keep in her memory forever. Side note: the visuals tell the story better. }
So are you happy now?
There is no such thing as decided farewells
Meet me in that memory that was once beautiful.
later edit
I had to write a post description (for SEO settings) and I thought
to share that here as well
Released in 2012, 2015, 2019 and 2020. Come down this memory lane with me as we spend a moment honouring this friendship. And of all the friendships and relationships that we find in hearing IU and Sulli's story.
Sources