There are many different variations, which some include seafood or pork instead of beef. I prefer the one with beef, which I honestly prefer without the beef itself. The blogs I've been following, Beyond Kimchee, Nosh on me, and Korean American Mommy, have different variations of 순두부찌개. Below is Nosh on me's picture of her soup from her local Korean restaurant with seafood.
For those curious, it usually comes with Oysters, Clams and any kind of fish they put it with. Usually white fish. Beyond Kimchee has a recipe on this, but she has Clams and Beef. Interesting combination and she made it herself, which doesn't matter how it should be made since you can really customize it.
Oh yeah, I forgot to mention. This soup usually comes with a raw egg on top because the soup is boiling as it gets to your table at any Korean restaurant, which cooks it while you wait for it to cool down.
Korean American Mommy has such a great flow in her blog about the making of the soup, it made me hungry after I just ate dinner. She showed pictures of her using beef, boiling the water to make beef stock, the addition of other ingredients, and the final product.