Gmarket
I believe these are the official sellers for these brands on Gmarket (http://global.gmarket.co.kr)... and if they're not, well they sell a lot of the brand.
NameSellerWebsiteWorldwide Shipping
BRTCBRTC (ami_brtc)http://www.brtc.co.krY
Coogi (쿠지)쿠지 본사 직영 (coogilmw)http://www.coogi.co.krN
Dr Jart (닥터자르트)닥터자르트 (bodylab)http://www.drjart.comY
Elishacoy (뷰티조아)천연화장품♣뷰티조아 (elishacoy2)http://www.elishacoy.comY
Enprani (엔프라니)엔프라니 뷰티샵 (pobby0103)http://www.enprani.comN
Etude House (에뛰드하우스)에뛰드 직영몰 (etudegmark)http://www.etudehouse.comY
Gowoonsesang고운세상피부과직영샵 (plezokorea)http://www.gwssmall.co.krY
Hanskin (한스킨)한스킨 (hanskin)http://www.hanskin.comN
La Foret라포레샵 (innoface)Y
Lioele (리오엘리)lioele (miche03)http://www.lioele.comY
Lotree (로트리)제니e-shop (kp7793)http://www.lotree.co.krY
Missha미샤샵 (misshashop)http://www.missha.netN
Peripera◆페리페라◆ (tree005656)http://www.peripera.co.krY
SCINIC (싸이닉)싸이닉 (cherrya1)http://www.scinic.comN
Skin79 (스킨79)스킨79 (skin797979)http://www.skin79.comN
Skin Food (스킨푸드)스킨푸드샵 (eskinfood)http://www.theskinfood.comN
The Body Shop (더바디샵)더바디샵(본사) (bodyshop)http://www.thebodyshop.comY
The Face Shop (더페이스샵)THEFACESHOP (faceshop01)http://www.thefaceshopen.comN
tony moly (토니모리)tonymoly (tonymoly11)http://www.tonymoly.comY
VOV (보브)/Jadilla J (제이딜라 제이)VOV 제이딜라제이 (vovcare)Y
Zeniswell (제니스웰)zeniswell (COVISCO)http://www.zeniswell.comY
Castledew (캐슬듀) / COSLINE (코스라인)
KOSE (고세)
LANEIGE (라네즈)
Prorance (프로랑스)
Sony CP (소니CP)
NameSellerWebsiteWorldwide Shipping
BRTCBRTC (ami_brtc)http://www.brtc.co.krY
Coogi (쿠지)쿠지 본사 직영 (coogilmw)http://www.coogi.co.krN
Dr Jart (닥터자르트)닥터자르트 (bodylab)http://www.drjart.comY
Elishacoy (뷰티조아)천연화장품♣뷰티조아 (elishacoy2)http://www.elishacoy.comY
Enprani (엔프라니)엔프라니 뷰티샵 (pobby0103)http://www.enprani.comN
Etude House (에뛰드하우스)에뛰드 직영몰 (etudegmark)http://www.etudehouse.comY
Gowoonsesang고운세상피부과직영샵 (plezokorea)http://www.gwssmall.co.krY
Hanskin (한스킨)한스킨 (hanskin)http://www.hanskin.comN
La Foret라포레샵 (innoface)Y
Lioele (리오엘리)lioele (miche03)http://www.lioele.comY
Lotree (로트리)제니e-shop (kp7793)http://www.lotree.co.krY
Missha미샤샵 (misshashop)http://www.missha.netN
Peripera◆페리페라◆ (tree005656)http://www.peripera.co.krY
SCINIC (싸이닉)싸이닉 (cherrya1)http://www.scinic.comN
Skin79 (스킨79)스킨79 (skin797979)http://www.skin79.comN
Skin Food (스킨푸드)스킨푸드샵 (eskinfood)http://www.theskinfood.comN
The Body Shop (더바디샵)더바디샵(본사) (bodyshop)http://www.thebodyshop.comY
The Face Shop (더페이스샵)THEFACESHOP (faceshop01)http://www.thefaceshopen.comN
tony moly (토니모리)tonymoly (tonymoly11)http://www.tonymoly.comY
VOV (보브)/Jadilla J (제이딜라 제이)VOV 제이딜라제이 (vovcare)Y
Zeniswell (제니스웰)zeniswell (COVISCO)http://www.zeniswell.comY
Castledew (캐슬듀) / COSLINE (코스라인)
KOSE (고세)
LANEIGE (라네즈)
Prorance (프로랑스)
Sony CP (소니CP)