When the South Korea and North Korea get unity, they will have a lots of benefits or happiness.

First, South, North Korea separated families will meet together. In 1980s' there was a broadcasting from KBS. Finding separated families. However, when the North and South Korea separated families meet together, I think there will be a Meeting separated families. That's a great thing when we get unity.

Next, North and South will have a great culture. Like clothes, South has hanbok. When we get unity the hanbok get more prettier too. Also, in the North Korea has a lot of iron ore, So the Korea will be more developed too. This just a half of the benefit.
And there was a unity of South and North Korea families. The 2015/10/22 was the last day when there are meeting together, the have a lots of presents for each and each. But they will meet again.

Plus, the KBS finding the separated families became the unesco heritage. Also, what I said, if the KBS meeting separated families will be a broadcasted, it will be a unesco heritage again. There will be a lot of fun and happiness too.
So, in conclusion, I think we will have a lots of benefits for the unity.