Waiting Room 3 locks from the inside, and lately I hear that sound a lot. I don't knock.

• Seo DainI do. Three knocks.
  Kang TaeoSo that's why he opens it for you.
• Choi BoksunTaeo, at times like that you just sit by the door.
  Kang TaeoGrandma, that'll wreck your knees.