  We study the mass spectrum of mesons at high temperature in $SU(2)$ gauge
theory with two flavors of Dirac fundamental fermions. Numerical simulations
are carried out on anisotropic lattices using Wilson fermions, with lattice
parameters tuned so that Euclidean symmetry is restored at low energy. We
determine the pseudo-critical temperature $T_c$ using renormalized Polyakov
loops. We calculate temporal and spatial meson correlation functions across
$T_c$, and observe a clear sign of parity doublings above $T_c$ in both vector
and scalar channels. The degeneracy between parity partners in the spectrum
indicates that the enhanced $SU(4) \times U(1)_A$ global symmetry of the model
is restored at high temperature.
