Soo Hyun's mother is dead set on bringing down Green Bang, while Ji Woo's family gets a fresh start in Korea.
Joong Ho raises Soo Hyun as his own son. Years later, Joong Ho's sons Min Ki and Soo Hyun became NIS agents.
Min Ki falls in love with Ji Woo, but he sees that her heart belongs to his brother and best friend, Soo Hyun.
Soo Hyun travels to Bangkok for his revenge and Ji Woo follows him. There, they take a walk down memory lane.
Director Jung convinces Soo Hyun to go undercover, so Soo Hyun fakes his own death for the mission.
After saving Mao, Soo Hyun becomes his trusted right hand. Meanwhile, Min Ki slowly approaches Ji Woo.
