DDHifi Surface. A Moondrop collab?

Every IEM on this channel is self-funded. I buy everything myself — no freebies, no review samples, no sponsorships, no affiliate links, no monetization. These are my thoughts on the DDHifi Surface iem. Bought this with my own money since quite a few people were pegging this as a (1) Moondrop collab iem and (2) a warm iem and (3) quite good. Had to hear for myself. Here are my thoughts.