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We present new spectrophotometric and spectropolarimetric observations of Mrk1239, 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 1239is more similar to type-2 active galactic nuclei like NGC 1068. Detailedanalysis of spectral energy distribution in the UV-optical-IR yields twocomponents from the nucleus: a direct and transmitted component that is heavilyobscured ($E_{B-V} \approx 1.6$), and another indirect and scattered one withmild extinction ($E_{B-V} \sim$ 0.5). Such a two-light-paths scenario is alsofound in previous reports based on the X-ray data. Comparison of emission linesand the detection of He\,{\footnotesize I}*$\lambda$10830 BAL at [-3000,-1000]km s$^{-1}$ indicates that the obscuring clouds are at physical scale betweenthe sublimation radius and that of the narrow emission line regions. Thepotential existence of powerful outflows is found as both the obscurer andscatterer are outflowing. Similar to many other type-2s, jet-like structure inthe 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-2counterpart of NLS1s. The identification of 1 out of 8 prototype NLS1s as atype-2 counterpart implies that there can be a substantial amount of analogs ofMrk 1239 misidentified as type-1s in the optical band. Properties of thesemisidentified objects are going to be explored in our future works.

Mrk 1239: a Type-2 Counterpart of Narrow-line Seyfert-1?