  We use the hyperK\"aler geometry define an disc-counting invariants with
deformable boundary condition on hyperK\"ahler manifolds. Unlike the reduced
Gromov-Witten invariants, these invariants can have non-trivial wall-crossing
phenomenon and are expected to be the generalized Donaldson-Thomas invariants
in the construction of hyperK\"ahler metric proposed by Gaiotto-Moore-Neitzke.
