kisses x kiss x kisses has a
pretty interesting side couple ?? no smut or trashed and happy ending!
Someone else asked a similar question a bit after u and has some responses. They didn’t have the same specifications but if u check the tags/comments Itll probably be okay: https://www.mangago.me/home/mangatopic/23097008/
I stand by my answer of Green Apple Paradise since it fits ur qualifications too: https://www.mangago.me/read-manga/green_apple_paradise/
have you read merry marbling? its a super fluffy (and i mean suuuper duper fluffy) school life bl and the side couple is pretty goofy LOL
i honestly prefer their dynamic over the main couple… but both are really cute in their own ways!!
Someone plz recommend BL manhuas or manhwas with GOOD side couples. Also no smut and no tragedy either. I accept angst if it has a happy ending.