They were born to break the law—and trained to spy. After years apart, Jungkook and Hana reunite on the streets of Seoul—both carrying scars, secrets, and criminal records. Their reunion sparks a chain of heists, betrayals, and unexpected feelings. Hana was once part of an elite spy organization. Jungkook? A master thief who knows too much. When the agency decides to reclaim its lost assets, their love becomes a liability—and their enemies multiply. From underground crime rings to high-level espionage, nothing is safe. Not even the President. "Fire up" is the explosive beginning of the "Spy+Thief=Family" series, where love is dangerous, trust is fragile, and loyalty may get you killed.