As the models of a clothing brand, Lee Hyun Woo and IU spent the day together during a shoot.

But the peace was soon broken, when IU began posting up photos of Lee Hyun Woo on her Instagram, poking fun at the actor.

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IU began easily with, "Are you cold?"

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Followed by, "Did you come to rest?"

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And, "Are you hiding?"

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Lee Hyun Woo, realizing that photos of himself were going up online, retaliated, writing, "I declare war."

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But before Lee Hyun Woo could make another move, IU posted a new photo, writing, "Done! Good work everyone! #UnionBay #LeeHyunWoo #KillerSmile."

As of 5:20 PM KST, the war ended with Lee Hyun Woo posting this sad Instavideo, writing, "Lee Ji Eun (IU) posted a strange photo of me...but...I have no photos to fight back with. Is this my defeat.... #Sigh #Spacingout #cannotjustlose."

Will the photo war continue? Or is this IU′s win?

Photo Credit: IU and Lee Hyun Woo′s Instagram