Because of the prince and the tortoise :')

But seriously:
If you haven't watched Part 1, then don't watch this. This doesn't stand alone.

If you loved the first part of the series and felt like there were unresolved matters and want to enjoy watching the main couple more, then watch Part 2. All the same characters are there.
I gave this overall score of 7.5/10. Because I felt that the plot is now completed (or well used) and this was an okay continuation to the 1st part. They could have changed the characters (/enemies)a bit. Now the plot felt repetitive.