  We report on the discovery of a rare case of spatially and kinematically
resolved galactic scale outflow at intermediate redshift, based on VLT/MUSE
optical integral field spectroscopic observation of the quasar HE 0238$-$1904.
This classical non-broad absorption line (non-BAL) quasar at $z=0.631$ remains
underexplored in its optical emission lines, though its UV absorption lines are
well-studied. We identify a superbubble driven by HE 0238$-$1904 from the
emission line morphology, line ratio diagnostics and kinematics, showing a
one-sided outflow reaching a projected distance of $R \sim 55$ kpc from the
nucleus. The bulk of the ionized gas, with a characteristic mass $M \sim
10^{8}~\rm M_{\odot}$, is blueshifted by $v \approx 700$ km s$^{-1}$ with
respect to the quasar systemic velocity. The outflows detected using absorption
line and the emission line are likely stratified components of different
spatial scale and velocity in the ionized phase outflow. Although feedback in
HE 0238$-$1904 is taking place on kpc scale, the kinetic power of the outflow
at 55 kpc ($\ll 0.1\% L_{bol}$) implies that it is inadequate to regulate
effectively the evolution of the host galaxy at this large scale.
