Whereabouts of the Grail

What are you doing here? Looking for 성배? I guess I got 성배 from bottom of the sea. A few days ago, I picked up a gold glass. It looked miraculous.

I can't give it to you if you need it. But would you do me a favor?

I explored the sea for a long time and my equipment is all broken. To fix it. I have to go to 아쿠아리움 but don't have enough time. So I'm thinking of using a sturdy 상어 틀니 to fix everything. Can you get 10 상어 틀니 from 샤크?

It was tough to pull it up. It's worth it.

Finally, you came back. Thank you. This is what I picked up from the sea. Is this what you're looking for?

Good. I don't know where you're going to use it. It's valuable. Please keep it safe!

Where is 10 상어 틀니?