https://blog.faceutil.com/2017/03/28/%eb%a7%88%ec%9d%b8%ed%81%ac%eb%9e%98%ed%94%84%ed%8a%b8-1-7-10-%eb%b1%80%ed%8c%8c%ec%9d%b4%ec%96%b4-%eb%aa%a8%eb%93%9c-vampirism-%d0%b1/