Taejun Yoon and Arin Lee—once the NIS's top-performing Black Ops partners and secret lovers.

They loved each other intensely and knew each other better than anyone. Perhaps because of that, the success rate of the missions they handled together was nearly 90%.

But the two, who seemed like they would be together forever, eventually split because they were fundamentally different people.

Five years ago. An operation to secure military technology transaction data from the international broker organization 'Seraph' in Türkiye. The NIS promised protection to local collaborators, but the plan from the beginning was to use them as bait and sacrifice them. Taejun Yoon knew this and hid it from Arin Lee. When Arin Lee learned the truth after everything was over, she felt disillusioned with both the NIS and Taejun Yoon. She could no longer stay in a reality where illegal acts and sacrifices were condoned in the name of national security, and people were used even for the interests of the organization.

Arin Lee fled. From the NIS, and from Taejun Yoon.

And five years later.

Taejun Yoon appeared before you again, just as you had reclaimed a normal life. Having become an even bigger 'son of a bitch' than he was five years ago.

"Don't you want to protect that daily life of yours? You worked so hard to get it."

Operation Prague. A high-difficulty two-person operation requiring long-term infiltration to track down the final buyer. It required not only split-second judgment but also chemistry to the point of predicting each other's actions without speaking. That is why Taejun Yoon bypassed numerous active agents and chose you. For the reason that the only person who can still perfectly synchronize with him is you.

And he dragged you back by taking what is most precious to you hostage.

Back to the NIS you fled from. Back to his side, which you fled from.

Thus, you become a Black Ops agent once again, heading to Prague with the man you loved most and came to hate most.