STORYLINE: Soon-ae got involved in a top-secret mission when she mistakenly took Yoo-il's pen after giving him a traffic ticket. To keep his identity confidential, he tried to retrieve the pen but unfortunately, Soon-ae misplaced it. Since the pen contains classified information, a lot of underground organizations are battling over it. But Yoo-il and Soon-ae are desperate to find the pen before anybody else.

Yoo-il was able to get possession of the pen after a series of mishaps. When he found out it's worth, he decided not to surrender it to the ones who hired him. Not only did he put his life in danger, but also managed to make himself suspicious in the eyes of Capt. Kang, Special Investigations leader.

Soon-ae was chosen to be part of Capt. Kang's team. She was first overwhelmed with the promotion but when she learned that it involves the cause of his husband's death, she got terrified of knowing the truth. What made the issue more complicated is the possible connection of Yoo-il to the case. She got caught in between being a police officer and as Yoo-il's spy partner, "Koala".

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Since Soon-ae doesn't really know Yoo-il's true identity, she was brainwashed into thinking that he is the key to their mission. So when she was offered to stay at Yoo-il's, she used it as a way to go around his business. But behind all the suspicions, they still became closer than they expected and fell in love.

With all the information they found, a lot of big names in the business and politics came out. As the team tried to unveil the truth, their profession and lives were put in jeopardy. Capt. Kang has to give up his place to stand by his belief. Surprisingly, the investigation was closed unresolved because of a traitor in the team.

Just as Yoo-il is about to start anew with Soon-ae, the Special Investigations team found out his involvement to the case. He tried to escape but was shot and fell into the ocean. His body was never found which gave Soon-ae enough reason to hope that he is alive. Soon-ae carried on with her life still thinking of Yoo-il. Her waiting came to an end when she got a phone call from "sam-shik".

REVIEWS: It started out to be an interesting drama. What's remarkable is how a pen could create such impact. Then the intensity subsided when a lot of people got involved. The more it got complicated and confusing, the less appealing it has become. But I think, the misunderstanding on who's who was hilarious.

What really made me watch this series is DENNIS O! Since Daniel Henney was a big hit in MNIKSS, I think this is one of the reasons why the network decided to include another halfie… and it wasn't a bad move. I bet a lot of people were drawn to this drama because of Dennis, just like me. But on the latter part of the story, I started to like Joo-hyun better. As I look at him, he became more and more gorgeous. He is so rugged and manly. His physique started to grow in me. And his character as caring and gentleman really adds up to his points. Dennis is undeniably good looking but Joo-hyun has the package.

Nam Sang-mi definitely was given a break here. I've already watched two of her movies (She's on Duty, Spy Girl - she really has this thing with spies, huh?) but didn't get to notice her beauty and talent not until now. It was kind of long overdue but being paired to a rising halfie star made her featured drama a success.