Korean`s big bow
After finishing Cha-Lye, when it comes Korean`s new years, younger people bow to elder family, which is called "Se-Bae". Then, people have breakfast and visit neighbors to bow. If a person comes to your house to bow, then you are suppoed to serve liquor and food, but to the children instead of liquor you give them the New Year's gift of money(usaully called "Bow money") and rice cake or fruits.

big bow
Another meaning of the cha-lye is Ancestor-Memorial-Rites On New Year's Day, people hold a memorial service in the main floored room or big room, and it is called "Cha-Lye". Behind a sacrificial table, there is a folding screen set up and on the table all New Year foods should be set up. The way to set up foods depends on the region and family but mostly, fruits are on the front row(red one is on the east side and white one on the west). Vegetables should be on the second low, soup on third(fish-soup on east, meat-soup on west), fried foods on firth, and on the last row there should be rice.
These things are usually had on just new years. Big bow is, gathering your hands (for men left hand over) then, kneeling both of knees down to the floor slowly and then bending your back at the same time your head down to the floor with hands.
For women it is a little different, when women bow, they are going to kneel down just one leg and both of your hands on the ground, ultimately chin down.
However, in general, these things really take a lot of time, so, usually we are standing up and nice and easy bend back. Sometimes when we are really busy or rushing somewhere, we do just chin down or to someone who is just standoffish person, but for friends, we just shake hands in the air. And if you are older than someone who bowed to you, you don’t have to bow back to them. You can just shake hands in the air or just say “Hi”.
