Huh, why did people downvote your comment? You did say that you apologized if it was a spoiler.... Ugh, some people are just too trigger happy I think.
Lezhin plus is manga reading app or the original sourse of this manga or some other Manga. They give away 10 coin for free if you download and login. This coin are use to unlock manga chapters. Sorry I'm bad at explaining hope you understand and if you want to check out here's the link https://www.google.com.kh/amp/s/social.lezhin.com/2016/10/21/released-for-android-lezhin-comics-plus/amp/ (I may sound like advertiser haha! )
If you download " Lezhin plus" you'll get 10 coin for free I just found out last night ヾ(☆▽☆) Haha!! Uh...if it spoiler sorry...