yes. I miss that feature as it was also present in my yb-100. I think gs-150 also has it under the crankcase. Check out this from Haynes manual as its also not present in Brazilian cg125.
Routine maintenance: changing the engine oil - CG125(BR)-K model
Unlike previous models, the BR-K does not have an engine
oil drain plug in the crankcase. Instead, the engine oil is drained
by removing the large hexagon-headed cap which houses the
oil filter gauze."
Here is pic of oil drain plug that is not in our cg-125
so oil is drained from here