■ Millie's Library https://www.millie.co.kr/v3/brand/update 
Features: It has 50,000 books. E-books can be used on mobile apps, PCs, and some models of Crema. When you use the e-book monthly membership product, you will get a free benefit for the first month you sign up. The amount varies slightly depending on the payment method and the device you use. Payment is possible on the Google Play Store for Android and the App Store for iPhone.
-E-book regular subscription: 9,900 won per month 118,800 won per year 99,000 won Unlimited access to all Millie's content
-Paper book regular subscription: 15,900 won per month 202,800 won per year 183,000 won Unlimited access to all Millie's content+ paper book + e-book delivery every 2 months

■ Ridibooks https://ridibooks.com 
Features: Only items registered in Ridiselect can be used on a monthly subscription basis.
-Free for the first month when subscribing, 4,900 won per month after 1 month. Cancel with one click at any time.
New additions are quite active, but there are also many items that are discontinued. It is good to check the announcement and read taking into account the closing date. In addition to pure literature, it also has a large number of genre novels. The viewer function is convenient, and what's special is that it sells its own e-book reader, Paper. https://paper.ridibooks.com

■ Yes24 Book Club http://m.yes24.com/bookclub/intro

Features: Available on PC Crema Viewer + mobile Yes24 e-book app.

■ Kyobo Bookstore SAM https://sam.kyobobook.co.kr/dig/sam/pssbuy
Features: You can purchase and use the SAM special price voucher [Monthly subscription].
-SAM Unlimited 9,900 won (Free for the first month)
-SAM2 Premium 7,000 won (1,000 won for the first month)

■ Google Play BOOK https://play.google.com/store/books?hl=ko-KR 
Features: It's not a monthly subscription service, but it's a place where you can sell single e-books, so I'm introducing it together. The Google Play Store on Android also sells books. Once you register your payment method, you can purchase a single book.

■ Joara http://www.joara.com 
Features: A specialized site for genre literature such as fantasy, romance fantasy for women, and romance. It is not a monthly subscription, but it has a time-based pass, which is subdivided by category, age, and time zone. Please refer to the table below for prices.