It is all in korean, I know Korean enough to get me by, but there are tutorials online on how to do it. But knowing Korean is important or at least if you remember how to do it, or if at least specifically the key words you need to click on. I buy purely on Lehzin, cause it's very simple to use, and you don't have to do that whole process to view 18+ comics. I have bomtoon too, but it was a pain to do the verification. And it expires after a year, so you have to keep redoing so I just gave up lol, besides all the comics I read on their I can purchase the english version on the english websites that host them like Tapas, Tappytoon. So I can't help you on how to the step by step process
I just found out today, and from what I know the 1st ep is tomorrow. It's available on ridibooks, but I've never used that website before, but it's like bomtoon where you have to verify age.