Where To Buy Albums In Hongdae

Would anyone know where can I buy Kpop Albums and Light Sticks.. Exo, Bts, Seventeen, Blackpink,Twice, Wanna One, and the like.. I got info that a big book store called Kyobo is also good for buying music CDs including K-pop albums.
Would anyone know where can I buy Kpop Albums and Light Sticks. Ex. Exo, Bts, Seventeen, Blackpink,Twice, Wanna One, and the like. We will resell these in .
From CDs to stationery items, you can buy everything.. It has a merchandise store called "SUM" where you can get basically everything related to SM Artists.