The Mule Family (뮬 가문, Myool Gamun) is a family made up of Wonsuls. They have to take a special test in order to become one. They are not as well known as other families, as Khun did not recognize the name (although he may have just been expressing the fact that he doesn't care).
Spider-Man: No Way Home Trailer Dropped - The Loop
Do you like this video?