How did they do the special effects for 당신 & I???Like Harry and Zayn's special effect for example...when Harry turned around Zayn appeared.So please tell me how they did those special effects.

Oh 당신 mean when they all morphed into each other.That part was amazing and I think the director and editor must have used a special type of computer to make the guy's images,I'm not really sure.And if 당신 want to know what those 겨울왕국 figures of them were,they're called freeze frames.

The director and the editor must've used maybe a special computer and used their 이미지 to make it look like they turned into each other.