A word on Korean soft drinks: either they are incredibly sweet (sweeter than most other drinks) or their flavor seems to deathen your tounge with staleness. Either way: you can’t drink much of them. This particular soda belongs to the first type.
If you know the typical taste of bubble gum, you know what this drink tastes like. It is the same sensation as taking a big bite out of a Hubba Bubba roll. Sure, there might be a little bit of melon flavor, but its mostly sweet and artificial. If you are into that, this might be your new favourite drink. I personally don’t linke it, though.
Would I buy it again? No. (Maybe to mix it with some very strong liquor, though.)
Would I recommend to try it? Only if you put some extra sugar in your mountain dew anyways.