Using agile methods to develop new software project has become one of the mainstreams of software development in recent years. However, for legacy systems, how to apply agile methods to improve their robustness is comparatively less investigated by researchers. In our previous research, we proposed an approach which can improve the robustness of legacy systems by composing and implementing robustness stories. Based on this method, in this research we take SyncFree, an open-source software, as an example to demonstrate how to integrate the robustness model, robustness stories, exception tests, refactoring of exception handling, and exception handling tools to improve robustness of legacy systems.