Because both bird's nest and tremella have the function of moistening lung, but the price of bird's nest is too high, and the price of tremella is very common, so it is more cost-effective to eat tremella in moistening lung.

Bird's nest is definitely different from eating tremella, and everyone with basic common sense knows it. Bird's Nest is a silk-like structure vomited by Jin Siyan, which is built to feed a new generation. Tremella is an edible fungus.