Two friends, members of the South Korean military, are recruited by a secret black ops agency.

Hyunjun and Sawoo, close friends and rivals from the South Korean special forces, are recruited by the secret agency NSS. They both fall for Seunghee, the beautiful but lethal profiling specialist at NSS. When they are faced against each other in a nuclear terrorist attack, they are forced to make their final decision and Seunghee's formidable secret is revealed.

The son of a North Korean spy decides to follow in his father's footsteps to protect his little sister.

Woo-Hyun is Korean man and Haruka is Japanese woman. They live different lives, but they both carry emotional scars from their first love. Woo-Hyun has yet to get over his first love, but he still wants to believe in true love. Haruka is a woman wants answers relating to love.