Dong-joon's newfound confidence and rediscovered sense of justice make him determined to take down Jeong-il and set things right for Yeong-joo and her family. The several antagonists of "Whisper" are starting to feel the pressure of their power games and cracks have begun to form in their mighty facade. Everyone has reasons to fight which are important to them and this means that backing down indefinitely is not something they are willing to do.
I am not sure when Dong-joon (Lee Sang-yoon) went from backstabbing villain to a fighter for justice and moral standards, but this is a thing that is happening right now and so our lead is busier than usual. At the same time, Dong-joon is being way too cocky with even his own allies, willing and blackmailed, which is already starting to backfire. This does create tension, however, so it is a welcome flaw of his approach to things.