Shilla Duty Free announcement on TVXQ remaining as their spokespeople via their official weibo account :

Often, there are fans asking Shilla if TVXQ are Shilla’s spokespeople. The answer is “definitely”. Today, Shilla will again give you some of TVXQ-oppa’s newest pictures!

it seems that SHINee will also model for The Shilla Duty Free

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Credits:

The Shilla Duty Free Weibo (新罗免税店),
Translation by @snxy
Shared by TVXQ! Express