  We present new spectrophotometric and spectropolarimetric observations of Mrk
1239, one of the 8 prototypes that defines type-1 narrow-line Seyfert galaxies
(NLS1s). Unlike the other typical NLS1s though, a high degree of polarization
($P\sim$5.6%) and red optical-IR ($g-W_4$ = 12.35) colors suggest that Mrk 1239
is more similar to type-2 active galactic nuclei like NGC 1068. Detailed
analysis of spectral energy distribution in the UV-optical-IR yields two
components from the nucleus: a direct and transmitted component that is heavily
obscured ($E_{B-V} \approx 1.6$), and another indirect and scattered one with
mild extinction ($E_{B-V} \sim$ 0.5). Such a two-light-paths scenario is also
found in previous reports based on the X-ray data. Comparison of emission lines
and the detection of He\,{\footnotesize I}*$\lambda$10830 BAL at [-3000,-1000]
km s$^{-1}$ indicates that the obscuring clouds are at physical scale between
the sublimation radius and that of the narrow emission line regions. The
potential existence of powerful outflows is found as both the obscurer and
scatterer are outflowing. Similar to many other type-2s, jet-like structure in
the radio band is found in Mrk 1239, perpendicular to the polarization angle,
suggesting polar scattering. We argue that Mrk 1239 is very probably a type-2
counterpart of NLS1s. The identification of 1 out of 8 prototype NLS1s as a
type-2 counterpart implies that there can be a substantial amount of analogs of
Mrk 1239 misidentified as type-1s in the optical band. Properties of these
misidentified objects are going to be explored in our future works.
