Reunion and if you count novels Turning(since the manhwa is really behind)
Define the relationship and love orbit but define the relationship takes the cake if you read both I’ll recommend another fav
https://www.mangago.me/read-manga/codename_anastasia/ or https://www.mangago.me/read-manga/payback_1/ or https://www.mangago.me/read-manga/eighteen_s_bed/ or i have a list of my favorites if you want
https://www.mangago.me/read-manga/passion_1/
https://www.mangago.me/read-manga/love_shuttle/
https://www.mangago.me/read-manga/nerd_project/
These, I just can't rank em because I love them alllllllllll~
codename anastasia, eighteen's bed, Yang Il-woo and I, Dreadful Night, Waterside Night, and Payback, are my fav
Don't Mess with the Puppy!
King's Maker, Honbul, Lost in the cloud
happy twogether, blood link, taming the tiger, shutline, kiss me if you can, My sadistic master and nerd project
Whoever see this comment, suggest me your favourite yaoi. I just wanna try other people's taste