
I have seen chapter 53 as 53 화- 마지막 화. Or 53 화-完
Half of chapter 53 is extras. Pictures to short segments.
마지막 화 means the Last episode.
完 Is kanji. in Japanese it is meaning perfect; completion; end
I bet it means that in Chinese or something similar because kanji originated from Chinese. The Japanese uses Kanji and have changed meanings or added many meanings. I don’t know Chinese. But I do have a good idea on the Kanji most of the time since I know Japanese. Koreans do use kanji but differently from Chinese and Japanese.
At the end of the last picture it has. < 애증결핍> 完
<Lack of Love and Hate> . Completion
After that it is
지금까지 <애증결핍> 을 사랑해주신 모든 분들께 감사드리며 하진과 한겸처럼 항상 행복하세요.
It is something like thank you to all that loved for “Lack of Love and Hate” and always be happy like Hajin and Hangyeom.
I would think the final episode is Chapter 53. There could be extras and side stories.

https://www.bomtoon.com/comic/ep_list/jin01/?p_id=naverblog308 53화<최종화> ( final)

https://m.series.naver.com/comic/detail.nhn?productNo=4493891 53 화-完
Chapter 53. Final/completion

Kakao. Mrblue. Justoon. You can’t view the listing of each chapters without an account.
But boomtoon, series. Peautoon. Ridibooks you can view the listing of each chapter. You can. The last two had not updated yet. So people can see chapter 53 being marked as final or complete with Boomtoon and series without paying for the chapter or even having an account.

The chapter that was updated was 53 and it is the end. Mi Amore’s first comment should had solved it.
Now, she had to provided two links to the Korean sites where it shows it has ended. And the possibility of two other sites in support when they update.
If you have bought the chapter. You will see what Mi Amore said in her comment was true.
WHAT CHAP 53 IS THE END?