Article 50-2 of the Information and Communications Network Act (Prohibition of unauthorized collection of e-mail, etc.)

No one shall collect e-mail addresses by using programs or other technical barriers that automatically collect e-mails from the Internet homepage where the intention to refuse to collect e-mail addresses is specified.
No one shall sell or distribute e-mail addresses collected in violation of the provisions of Paragraph 1.
No one shall know that it is an e-mail address whose collection, sale and distribution is prohibited in accordance with paragraphs 1 and 2 and use it for information transmission.
A fine of not more than 10 million won in case of violation