Divide the red bean paste into 8 pieces, roll into balls. 

Mix yeast, sugar and milk together, let it rest for 10 minutes. Add the yeast mixture into the flour, 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. (So that buns will not become hard easily)