Rinse all fruits thoroughly under cool water and pat completely dry with paper towels. Cut the watermelon into small, bite-sized cubes. If using dragonfruit, peel and dice into similar-sized pieces. Hull and slice the strawberries into halves or quarters. Keep raspberries, blueberries, and blackberries whole.

Place all prepared fruits into a large serving bowl or punch bowl. Add the cubed coconut jelly to the fruit mixture. Using a large spoon, gently fold everything together to distribute evenly without crushing the delicate berries.

Drizzle the sweetened condensed milk evenly over the fruit mixture. Pour in the strawberry milk slowly. Stir gently with a large spoon to help the condensed milk dissolve completely into the liquid base.

Slowly pour the lemon-lime soda into the bowl. The mixture will bubble and foam slightly as you add it. Stir very gently to combine all ingredients without losing too much carbonation.

Add ice cubes to the bowl if desired for extra coldness. Ladle the hwachae into individual serving bowls with spoons. Serve immediately while the soda is still fizzy for the best texture and taste.