@ Scarlet Moira
So forget what I wrote below... I checked on Namuwiki and apparently there is no 19+ version... Which is good news. ( I'm still leaving everything just for information for people to know how it usually works in online publishing in South Korea).
I can't now, but I'm going to try BUYING the novels. Will repost here if it's done.
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Ok I get where you're coming from as it's not necessarily obvious on that page. It's not indicated that this is a censored version.
I used this page instead: 지금 거신 전화는 [단행본] - 웹소설 | 카카오페이지
This page divides directly the story by books so it makes it clearer:
1. First link is a trial version, you can read it for free: I didn't bother because I can't read the books anyway... It's just torture.
2. The two following links are volume 1 and 2.
3. Last Link is an extra story.
Now if you look below, you'll see
"이 작가의 다른 작품 " : This writer's other works and "동일작 " : similar works
And you can the links leading to the "chapter by chapter" list. You can see there's a small round with "15" on the cover. If you click on those you access the link given by NothingggggH above.
Similarly on the "chapter by chapter list" if you look below you'll see the link I just posted with a "15" ( and -30% discount but just be warned seems like the promotion is only available if you rent the novels for 3 months not if you buy them - if it's possible... I tried to click and for some weird reasons could never get to a 소장 (possess i.e buy) only the 대여 ( to rent) version - I can read in Korean but I still need to look up quite a lot of words so renting is not an option. No time enough to finish the books).
The links leads you to the version I posted above.
If there's no age restriction there would be no age mentionned (from what I've seen it's always 15).
Somebody with a non verified account doesn't even get access to the 19+ version. Now if you look you can see that there's some books which don't have any covers with a 19+. I'm guessing these works don't have a censored version yet or cannot be censored because most of the story is full of SPICE lol.
But yeah, from experience, any number on a cover means the version is a censored one: Either there's no number or if it's here it means there's another version available...
Maybe Kakao works differently I don't know... BUT the webtoon version doesn't have a number "15" on the cover which makes me think it is a censored version.
I'm used to Ridi and Mr.blue, bought webtoons and novels there, and it's clearer, when you click on a link, and there's a censored version, the age restriction is still visible on the main page.
Again, I might be mistaken ... and Kakao works different... But frankly the first episode was so BURNINGLY HOT there's no way in my head the novel isn't HOTTER ( ahem).
If you speak Chinese, maybe it's available there:
https://www.haodoo.net/
This page is in traditional Chinese though. Gots lots of books there myself but I can't read them yet and it's still very difficult for me to navigate on chinese pages. I'm learning both Traditional and Simplified Chinese but it's my 6th language so... I'm currently at a level where it takes me about 1 hour to read a single sentence... IF the sentence isn't too long.
(Nothing like reading to improve one's language skill though. It's hard work but nothing can beat the result, so keep on practicing korean ^^)