Board Thread:Questions and Answers/@comment-63.155.110.178-20150505180237/@comment-26854521-20160822130215

Had nothing to do with the preview chapters. The chapter was out on Naver and there was a translation (just the text) out there at the time he said it. The wiki also receives small updates between Naver and Line release of the chapter, so if you don't read early translations you are likely to be "spoiled".