Even if you don't read lucky paradise it's totally fine as author made it as 2 complete different stories not much is shown in that story about the characters involved in love order, MC here is shown as just the supporting friend there that's all so you're not at all missing out on anything.
Hopefully somebody else who remembers each and every thing happening in that story may help you further.

Back when lucky paradise was painfully ongoing and i was annoyed w the characters and what was happening that time, i was tired and so fed up i thought “ho in better end up w his best friend atp” and dropped the story
It’s refreshing to see them again being best friends.