The city of Seoul is said to be introducing the 'Climate Companion Card', an unlimited public transportation pass, starting from January 27, 2024.
The Climate Companion Card allows unlimited use of public transportation such as subways and buses, as well as the public bicycle 'Ttareungi', with a single card. 
They say there is. The price is divided into two types, 62,000 won and 65,000 won. The mobile card can be used by transferring the monthly fee through the 'Mobile T-Money' app on a smartphone and specifying a use date within 5 days.
For iOS-based smartphones, It is said that the mobile transportation card function is not installed, so a ‘physical card’ must be used. It is said that mobile card download and physical card sales services will begin from January 23, 2024, so it would be good for those who pay more than 62,000 won per month for public transportation to take note.
Seoul City, unlimited public transportation pass 'Climate Companion Card' The Seoul City Climate Companion Card allows unlimited use of public transportation such as subways and buses, as well as the public bicycle 'Ttareungi', with just one card. Unlimited use is available on all subways in the Seoul area, including Subway Lines 1 to 9, Sillim Line, Uisinseol Line, Suin Bundang Line, Gyeongchun Line, Gyeongui-Jungang Line, and Airport Railroad (Seoul~Gimpo Airport).
Because the fare system for the Shinbundang Line is different, use is restricted even within the Seoul section. Unlimited use of buses is possible on both city and village buses with a Seoul city license.
Metropolitan buses and late-night buses with different fare systems from licensed buses in other cities and provinces such as Gyeonggi and Incheon are not included. During the pilot project period in the first half of the year, two types of △62,000 won and △65,000 won notes were released in accordance with the availability of Ttareungi.
If you want to use a bicycle, you can use it at a low price by adding 3,000 won. Mobile card download and physical card sales services began on January 23rd, 4 days before implementation.
The city of Seoul will allow users to recharge the 'Mobile Card' with a credit card during the pilot project period, and is considering installing the Climate Companion Card on the postpaid transportation cards used by most citizens starting from the main project in July.