Spicy Korean Clam Chowder

Name: Spicy Korean Clam Chowder
Ingredients: 1 tablespoon Olive Oil; 3 ounce Pancetta; 1 Onion; 1/3 cup Celery; 3 Bay Leaf; 2 tablespoon All-Purpose Flour; 3 cup Whole Milk; 1 cup Clam Juice; 1/4 cup Sake; 2 tablespoon Gochujang; 1/2 tablespoon Miso Paste; 1 1/2 Russet Potato; 3/4 teaspoon Ground Black Pepper; 3/4 teaspoon Ground White Pepper; 3/4 cup Heavy Cream; 25 Littleneck Clams; 3 pound Littleneck Clams; 2 tablespoon Fresh Chives; 2 teaspoon Fresh Ginger; to taste Fish Sauce; 1 teaspoon Unsalted Butter