The irony? OnePlus was one of the earliest companies to drop the 3.5mm jack! Curse these greedy bastards!
I recommend: Moondrop Quark, the indisputable champion at its price range*, made by music lovers who have made a long line of wired earphones!
*:paired with proper tips, disregard a review unless it states that the tips seal perfectly or uses 3rd party tips that seal perfectly, use dual or triple flange tips if necessary