A
graduate
student
and
martial-arts
expert
rents
a
room
in a
house
owned
by a
single
mother
who
lives there
with
her
son.
A
local
street
gang
is
trying
to
recruit
the
son,
but
the
new
tenant
tries
to
help
the
boy's
mother
keep
him
out
of
the
gang.
When
they
learn
of
this,
they
target
both
the
mother
and
her
new
tenant.