spoilers!
he’s a diamond dust which is a special kind of omega where he basically lives his life as a beta unless its counterpart, a ghost, comes in and turns them into a full-fledged omega through continuous and consistent knotting. he can still release pheromones involuntarily, but he can’t detect them himself or control them and only a ghost can pick them up/feel them, no regular alpha can which is why only liu believes he’s an omega, cause only he can detect his pheromones.

is he actually a beta? can someone give me a heads up if there becomes a change or smth of that sort ?