The broth in this soup is potent, even without the Hibiki whiskey. The broth is rich in sweetness and sharpness as there were lots of seafood and 酸菜 in it, and there's some spiciness from the use of 野山椒.
I would start having this before pouring in the Hibiki whiskey which is served on the side. This way, you'll taste the broth before and after the whiskey, both of which are very enjoyable. The Hibiki whiskey wasn't too strong to overpower the soup, and instead lends another dimension of sweetness to it.