Tae Kyung's Logic.

The X's indicate a bad result. The O`s a good one. As we can see, this works out nicely for Tae Kyung, right?
Now, how do you think Tae Kyung comes up with this reasoning? Do you think that TK manipulates the arithmetic results to suit his own convenience...without even noticing it?..
shan shan shan sháaaaaaaan....(pic thanks to Soompi f)