https://www.mangago.zone/read-manga/shitto_wa_ai_o_kumoraseru/ kinda sounds similar to this one though i might be wrong (don't really remember the journal part)!!
Sorry this is not it. It was a full coloured manhwa and came out recently.
Thanks for your rec though.
Swore to myself I remembered this story and had some images in an album. I was correct. Took me a moment tho
https://www.mangago.zone/read-manga/incidentally_dyed_by_spring_s_love/
is this it? https://www.mangago.zone/read-manga/reunion/
So I'm looking for yaoi where they meet in school over Piano and later seme moves to abroad. At the same time, uke quits school and works in a hotel (owned by seme ofc). They meet after 10 years and reunite.
Also there was this journal thingy which gets misplaced.