BigoProblems/solution
This entire Problem comes from Diagram 1 of "Think Like a Pro -- Haengma" By Youngsun Yoon
is a good asking move. When White attaches at 3, Black can think about A and B.
Black's 1 is an efficient haengma making method that you should study. It is balanced up to move 4.
If Black responds differently, White can do the following: