ok, yeah it makes sense... now i searched for the specific harness and found this

but the plug i have in my car's trunk is like this (8pin female)

No doubt i should check the radios rear side before buying anything, but my Accord has different dash, any idea how to remove radio from there?

I also managed to find a picture of the back side from my radio. now it's sure the 8pin in the trunk is for cd changer

EDIT: added picture of radio rear side

 

ah, a non-US model. sorry, i didn't see if you mentioned that. yea, that changes everything. i'm not as savvy with the European models and options. you may want to call Pac-Audio to see if they have something. yea, that car is very different from the US 1999 Accords.

i did find this, mentions parts required to interface with that DIN plug. USA Spec is another good brand to try.
Honda, Acura, Volvo, Mercedes Benz* ipod installation

 

Well, i thought the picture of the radio in the first post is the clue, my bad. Seems like all the adapters are for US, i can't find any european online store or anything where they are sold. Can't even find EU Accord forum to be honest.
Anyway, if any EU model owner reads this, feel free to write your opinion.