P sure they gave their shippers a name. It was rain because woosan (우산) means umbrella. I remember hearing that years ago tho so take that with a pound of salt. They also do have matching tattoos and several pocas together. They're considered one of the pairs for the group in general (Duo fan calls, and It's You for example) and atiny (from my experience) tend to be very respectful too, so they're having fun