Hyun Joon (played by Lee Byung-hun) and Si-woo (played by Jung Joon-ho) are NSS (National Security Service) important personnel. They both fall in love with their beautiful boss Seung-hee (played by Kim Tae-hee), but the latter falls in love with Hyun-jun. Deputy Director Bai Shan sent them to rescue the scientist, who entrusted a USB flash drive to Xian Jun before his death. Hyun-joon of the Baeksan secret sect assassinates North Korea 2...