A Russian organised crime group is set out to steal an advanced chemical weapon from Korea and two secret agents are out to stop them. One is a veteran secret agent named Ahn Soo-ji who is a master of all forms of martial arts and envied by her comrades. Another is a rookie named Lee Jae-joon who's never been out on the field and always goofs up on the job. The two agents don't know each other's secret identity. All that they know is that they hate each other. As a couple that is... Soo-ji and Jae-joon were once a passionate couple until Jae-joon couldn't take her lies anymore. But all Soo-ji was trying to do was hide her secret identity. Nonetheless, the two went on their separate ways and by coincidence bump into each other years later while out on the job. As the two work out their screwy relationship, they go behind each other's backs to fulfil their mission to save the world.

"My Girlfriend Is An Agent" is clearly a Korean take on Hollywood's action film "Mr. & Mrs. Smith", but with an added dose of comedy that was a box office success in South Korea and could give Hollywood a run for its. The leggy actress Kim Ha-neul and charming actor Kang Ji-hwan served up outstandingly well as undercover agents in love with each other, yet are torn apart by their need to conceal their top secret careers.

Disguised as a travel agent, Soo-ji (Ha-neul) is a government spy with six years worth of field experience and is constantly having relationship problems with her boyfriend Jae-joon (Ji-hwan), who has become tired of her suspicious lies. He later breaks up with her over one final phone call and heads out of Korea, leaving her heart-broken. Three years later with Jae-joon gone, Su-ji works on a Russian mafia case involving biological weapons. During her undercover work posing as a janitor, she bumps into Jae-joon in the men's restroom and attacks him for leaving her and lying about his whereabouts. In fact, when he left Korea three years ago, he took on an assignment to Russia to track the very same Russian mobsters that Su-jin is currently working to bust.

Director Shin Tae-ra integrated various action sequences involving a high-speed chase on a jet ski, horse riding through the bustling city streets, dangerous mid-air sequences, and a frequent display of martial arts. Despite an array of action sequences, the stunts were most probably the weakest as they were too unrealistic and poorly choreographed. Thankfully, the comedy makes up for it entirely. There's an absolutely side-splitting scene in a haunted house involving Ji-hwan and a Russian mobster that was both wacky and witty. Ji-hwan's comedic performance was a joy to watch as he makes comedy look flawless playing a bumbling rookie spy with a high-pitched scream that will put the ladies to shame. Ha-neul seems to have a slightly more serious character, while her co-star seems to be the one doing more of the running scenes.

Working together for the second time after Korean TV drama "90 Days Of Love" (2006), the chemistry between the two stars are undeniable. There was even a rough, passionate kissing scene that had caused Ha-neul's lips to bleed, according to the actress' most memorable experience on set. Talk about a bloody kiss! Aside from the Korean language, the actors also spoke flawless Japanese and a very peculiar Russian, Korean style.

This action-comedy is purely for laughs and if you're all too familiar with Korean humour, you'll definitely enjoy this one.