  We consider the hydrodynamic limit of a stationary Boltzmann equation in a
unit plate with in-flow boundary. We prove the solution can be approximated in
$L^{\infty}$ by the sum of interior solution which satisfies steady
incompressible Navier-Stokes-Fourier system, and boundary layer with geometric
correction. Also, we construct a counterexample to the classical theory which
states the behavior of solution near boundary can be described by the Knudsen
layer derived from the Milne problem.
