Jung Eun's suicide surfaces again, and her sister Go Eun gets a glimpse of what caused it all to happen. Sung Chul and Do Ki do what it takes to bring justice to those involved. Do Ki gets on to a lead and heads straight into the heart of where it all begins. Meanwhile, Ha Na asks Do Ki to be their informant. The chairman of U data pays a surprise visit to the prosecution and meets with Prosecutor Kang Ha Na. However, her accusations do not affect the chairman surrounded by his big law firm lawyers. Later, Do Ki calls Ha Na to catch them red-handed, but the prosecution's visit turns out to be worthless.