Jeong Taeui has spent his entire life standing in the shadow of his brilliant twin brother, yet he’s always been content with living an ordinary and peaceful existence. That changes when his uncle suddenly appears with a suspicious “once-in-a-lifetime” opportunity that is actually a dangerous assignment. Though hesitant, Taeui eventually accepts the offer and agrees to work as an agent for six months.

Thanks to his friendly and optimistic nature, Taeui adapts to the unfamiliar environment faster than expected. However, everything begins to shift after he encounters Ilay Riegrow, an agent from another division. Rumors paint Ilay as a ruthless psychopath that everyone should stay far away from, but Taeui gradually realizes there is something hidden beneath that cold and dangerous exterior.

Still, getting close to Ilay is like stepping into flames, and Taeui can’t tell whether he’s prepared for the consequences of getting too close.