A 20% discount on marriage is to write letters to in-laws, elders, matchmakers, etc. When you get married, you can't seal it in a red envelope. There is a post with the recipient label on the front of the envelope. Marriage is a wedding ceremony, and 20% discount is to write letters to in-laws, elders, matchmakers, etc. You can't seal it when you put it in a red envelope, and the front of the envelope is labeled with the recipient's label, so you can write it to your in-laws, elders, matchmakers, etc. When you put a red envelope, it can't be sealed, and the front of the envelope is affixed with the recipient label.