In Hongdae, one of the best attractions you must see is Trick Eye Museum. Its an art gallery of paintings that gives an illusion of 3D paitings. Each ticket cost around 15,000 KRW but we got it for only 12,000 KRW. Check their website for discount coupons:  www.trickeye.com 

They welcome guest from different countries through this ceramic dolls. How cute!

Trick Eye Museum

Address: 357-1, Seogyo-dong, Mapo-gu, Seoul, South Korea