Divide the Red Bean Paste (250 gram) into 8 pieces, roll into balls.
Mix Instant Dry Yeast (1 1/4 teaspoon), Granulated Sugar (20 gram), and Milk (100 milliliter) together, let it rest for 10 minutes.
Add the yeast mixture into the All-Purpose Flour (180 gram), mix and form a dough.
Knead the dough for about 8 minutes until the surface is smooth. Cover with cling film or kitchen towel, let it rest for 30 minutes.
Divide the dough into 8 pieces, press it to form a dish. Add in red bean paste filling, seal it and roll a ball.
Place the dough on the parchment paper and put in a steamer. Cover the lid and let it rest for 30 minutes. The dough will grow bigger.
Steam at high heat for about 12 minutes, turn off the heat and wait for 3 minutes to take the buns out. Serve and enjoy!