Waiting room three locks from the inside, and lately that sound's been happening a lot. I don't knock.

• Seo DainI do. Three knocks.
  Kang TaeoSo that's why it opens for you.
• Choi BoksunTaeo, at times like that, you just sit outside the door.
  Kang TaeoGrandma, your knees can't take that.