https://blog.faceutil.com/2017/03/30/%ed%8c%a8%ec%b9%98-%eb%b0%94%ec%9d%b4%ec%98%a4%ec%87%bc%ed%81%acbioshock-%ed%95%9c%ea%b8%80%ed%8c%a8%ec%b9%98-%e3%89%ab/