Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The station is scheduled to become a transfer station with the Shinbundang Line in 2025. Once the Shinbundang Line station at Yongsan becomes operational, Yongsan Station will become connected with Sinyongsan Station on Line 4.
I'park Mall in Yongsan
In 2004, a major cinema opened adjacent to the station. In August 2006, the whole station building was made into a large department store, called I'Park Mall. The building now includes the railway station, subway station, the CGV cinema and several restaurants and shops, as well as housing the first building of the Yongsan Electronics Market. There is a bridge connecting I'Park Mall and the Yongsan Electronics Market. On floors B-1 and B-2 there is a very large E-Mart store along with a food court and a Burger King restaurant.
In the higher floors some of the restaurants include: KFC, Lotteria, Outback Steakhouse and many Korean and Japanese restaurants. Other outlets, such as Starbucks, Dunkin' Donuts, and Baskin Robbins, are also available. A duty-free store operated by HDC Shilla opened its doors in 2016, and the entire I'Park Mall underwent a major expansion in 2017.
There is 'ADIDAS FOOTBALL THEBASE', which uses the 8th and 9th floors together. 'ADIDAS FOOTBALL THEBASE' is a football stadium introduced as "a space for improving citizens' physical strength in the city." It has one indoor football stadium and seven outdoor football stadiums.
The Center : There is an Emart and Byeol(Star) Parking Lot in the basement, and the 3rd floor leads to Yongsan Station. CGV is located on the 6th and 7th floors.
Taste Park : Like The Center, the 3rd floor is connected to Yongsan Station, and CGV is located on the 6th and 7th floors. There are various restaurants from the 4th to 7th floors.
Fashion Park : Restaurants such as Shake Shack and Tim Ho Wan are located on the 1st floor, as well as Zara. SPA brand stores such as 8Seconds, SPAO, and Topten are located on the 2nd floor. The 3rd to 5th floors are connected to Dal(Moon) Parking Lot, and the 6th floor is connected to CGV.
Living Park : The Shilla I-Park Duty Free Shop is located on the 3rd and 7th floors, and the 3rd to 5th floors are connected to the Hae(Sun) Parking Lot. On the 4th and 5th floors, you can see various furniture and home decor products, and on the 6th floor, you can see kids-related products. D7(Food Cinema) is located on the 7th floor, and the cultural center is located on the 8th floor.
Station layout
Yongsan Station has six elevated island platforms and one side platform serving 13 tracks.