Basically. Though it doesn't apparently work the same way Umbreon does, the two of them evolved around the same time and yet they're different Pokemon.

[ The pair of Eevees have always been close since they were both Joonghyuk and Dokja's partners when they arrived. However, Siwoo was known to be spoiled a lot whereas Joonghyuk didn't nearly spoil his own and even lectured Dokja about it.

Siwoo extends one ribbon feeler to hold out to Hien for him to take. A greeting of sorts! The ribbons are soft like velvet, and when touched will give off a soothing aura so there's no harm in it. ]

He has a surprisingly soft side. He just hides it very well. Which is easy when he seems to be in a bad mood all the time.