If you are a shopaholic, Seoul is definetly your place. There are a lot of Duty free malls like LOTTE MALL, SHINSEGAE...etc. Almost all malls exceed 8 floors, and each floor has its specific item category. 

Most malls are located at: Myeongdong, Gangnam, and Dongdaemun districts

1. Shinsegae Department Store: Personnaly, I love Shinsegae because on its top there's a wonderful design garden. You can sit there peacefully and enjoy the fresh air and green areas. Notice that the garden is closed in rainy days.

• Opening Hours: [Daily 10:30-20:00 / Extended hours 10:30-20:30] 
• Address: [63, Sogong-ro, Jung-gu, Seoul]

2. Lotte mall : 

• Opening Hours: [Daily 10:30 – 20:00] 
• Address: [81, Namdaemun-ro, Jung-gu, Seoul]

3. Coex mall : This huge underground mall contains many souvenir shops but also an amazing aquarium complex that you can visit on a rainy day. It's known as the biggest underground mall in Asia.

• Opening Hours: Daily 10:30 - 22:00  
• How to get there: Line 2 Samseong Station exit 6 or Line 9 COEX Station

4. D-Cube City Mall : 

• Opening Hours: Mon - Fri 11:00 – 21:30, Sat - Sun 11:00 – 22:00 
• How to get there: Sindorim Station, exit 1 

5. Lotte Young Plaza : 

• Opening Hours: Daily 11:30 - 21:30 
• Address: 15 Sail-dong, Jung-gu, Seoul

6. Times Square Mall : 

• Opening Hours: Daily 10:30 - 22:00 
• Address: 15, Yeongjung-ro, Yeongdeungpo-gu, Seoul

7. Migliore: 

• Opening Hours: Tuesday – Sunday 10:30 – 05:00 
• Address: 18-145 Euljiro 6-ga, Dongdaemun, Seoul

8. IFC mall: IFC mall is one of the newest malls in Seoul.

• Location: Yeouido - Line 5 and 9