[1] The traditional writing system known as gugyeol, used punctuation to interpret Chinese characters in a way Korean speakers could understand.
[2][3] One of the marks used in gugyeol was a dot ⟨•⟩ called 역독점 (yeokdokjeom), which was used to indicate reading order.
[1] The conclusion of an idea or thought was indicated by starting a new line of characters from the top, as opposed to the western style punctuation of periods and commas which had not been introduced yet.
However, when it is written vertically, Korean writing tends to follow East Asian punctuation which includes ⟨。⟩ (고리점, goricheom) as a period, ⟨、⟩ (모점, mocheom) as a comma, and ⟨『...』⟩ (겹낫표, gyeomnatpyo) as quotation marks.
[1] In the North, guillemets 《 and 》 are the symbols used for quotes; in the South, quotation marks are equivalent to the English ones.