1. Used to show when or where an action or situation started.

a. Used to illustrate the time that a certain action or situation began or will begin: (start) from; (start) at

b. Used to illustrate the place that a certain action began or will begin: from. Can be used after 에서 (eseo) 로 (ro) also together meaning "from".

c. Used to illustrate an order of a series of actions.