Actor Lee Joon Gi updated his Instagram with a dramatic photo of “Scholar Who Walks the Night” filming!

Fans think the tall actor on the right might be Changmin~

https://instagram.com/p/3INTIOAoTv/

EDIT (150624):

seems like neither of them is Changmin as we thought first:

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Credits:

Lee Joon Gi’s Instagram (actor_jg),
Shared by TVXQ! Exprsss