Generate UTF-8 MD5 hash for Chinese in SQL Server

SELECT LOWER(CONVERT(VARCHAR(32), HASHBYTES('MD5', 'a'), 2));

Result : 0cc175b9c0f1b6a831c399e269772661

This is OK.

SELECT LOWER(CONVERT(VARCHAR(32), HASHBYTES('MD5', '啊'), 2));

Result : 795d6a1c51f0ac4b0856f5cac1846f3f

The correct result is 04c16ff7b157d4b4702bb24aa62651a5

Why do I get a wrong result?

Please solve my question, thanks!