Reply to the Comment on "General Non-Markovian Dynamics of Open Quantum System"

This is the reply to the 2nd version of the comment, [arXiv.1312.5286v2], by McCutcheon {\it et al.} on our paper [PRL 109, 170402 (2012)]. Our letter presents three examples. For the steady-state solution of the first example, i.e., the dissipationless part of Eq.(12) in the PRL, the 2nd version of the Comment claimed that "this [dissipationless] regime exists if and only if the total Hamiltonian is unbounded from below, casting serious doubts on the usefulness of this result." In this reply, we show again that the 2nd version of the Comment is also incorrect.