Why these sayings for taboo and luck in Korean?

1. Encouraging good behaviors (postures, harmonious society):

• When you put your hands on the chest while you sleep, you will dream a good dream.
  
• When you sleep long on the first night of your marriage, you will live long.

2. Discouraging undesirable acts or practices

• If you cry on the wedding day, you will not live well.
  
• The person who falls asleep first on the wedding night will die first.
• If you have your nails cut at night, you will lose your parents early.
  
• If you take a break on your way, you will stop studying.
  
• If you speak ill of somebody else's child, your child will become like that.
  
• If you study lying down, your knowledge will slip through your toes.
  
• If you eat something lying down, you will become a cow.
  
• If you sleep with your legs crossed, you will become poor.
• If you move your seat while eating, you will move often.
• If you move your seat twice while eating, you will marry twice.

3. Comforting for an unlucky event, and cheering for a good event

• When you see three mourners on the street, you have a luck that day.
• When you see a funeral car and touch the collar of your coat, you will have a good luck.
• When your belt get loose on the street, you will get new clothes.

When you see in your dream:

• When you have a bad dream, a good thing will happen to you.
• When you are insulted by someone, you will earn wealth.
• When you have a headache, you will be promoted.
  
• When you get beat up, worries will disapper.

4. Associate obejcts with events:

In your deam:

• When you pick up keys on the street, you will have a luck.
• When you see yourself reading, you will become wise.
• When you take a long trip, you will have a good luck.
• When you see a mirror broken, you will depart your spouse.
  
• When you lie down in the middle of a boat, you will die.

5. Social attitude

• If you get passed by a woman, it is a bad luck.
• When you see a man in the morning, you will have a lucky day.

6. Sheer superstition

• If your eyebrows is itching, a pleasant person will visit.
  
• If you bite your tongue while eating, there will be a visitor.
• If you look up the moon while pregnant, you have a good luck.
• When a magpie sings in the morning, there will be a pleasant visitor.