  We study adding flavors into the Maldacena-N\u{u}nez background. It is
achieved by introducing spacetime filling D9-branes or intersecting
D5$'$-branes into the background with a wrapping D5-brane. Both D9-branes and
D5$'$-branes can be spacetime filling from the 5D bulk point of view. At the
probe limit it corresponds to introducing non-chiral fundamental flavors into
the dual N=1 SYM. We propose a method to twist the fundamental flavor which has
to involve open string charge. It reflects the fact that coupling fundamental
matter to SYM in the dual string theory corresponds to adding an open string
sector
