Google query function return data ranges's header when using "group by".
The header includes property. Such as count, sum.
You can use as below.
=QUERY(F2:G4,"SELECT F, SUM(G) GROUP BY F LABEL SUM(G) '합' ",1)
F2:G4 is data range.
[label is not used]
구분 | sum count {colname}
col1 | col2
[label is used]
구분 | 합
col1 | col2
You can express it more clearly and pretty.