Kim Jeha was a former mercenary for a private military company who was framed for murder. Avianna is a secret love baby from presidential candidate Jang Se Joon. His wife Choi Yoojin rules with an iron fist using his daughter as a power play. While she tries to keep her power from her family. Jeha begins to work with his enemy to get revenge and to keep Avianna safe. What will happen in this retelling of the 2016 korean drama The K2?