https://notion.blog/%ea%b3%bc%ed%95%99%ed%96%a5%ea%b8%b0-%ec%98%a4%eb%a5%98-%ea%b3%bc%ec%97%b0-%ec%9e%ad-%ec%8a%a4%ed%8c%a8%eb%a1%9c%ec%9a%b0%eb%8a%94-%eb%b8%94%eb%9e%99%ed%8e%84%ec%9d%84-%eb%92%a4-2/