Spy War: Invincible Undercover with My System

An unexpected accident transports Su Jin into the chaotic intelligence world of the Republic of China, where multiple forces intertwine. This land is filled with countless moles, traitors, and intricate traps, leaving many agents trapped in deadly games between factions. Su Jin's greatest trump card is his awakened exclusive undercover assassin system, which unlocks four abilities: assassination, eavesdropping, disguise, and decryption. He can see through encrypted messages, forge new identities in seconds, silently eliminate targets from a distance, and monitor all confidential conversations... mastering every means of intelligence warfare. While others fail to see the chessboard clearly and step into enemy traps one by one, Su Jin secretly maneuvers by exploiting the conflicts between various forces. The traps of the Military Intelligence Bureau, the interrogations of the Wang Jingwei regime, the manhunts of the Japanese army, and the suspicions of underground organizations are all dismantled by him one by one. Walking in the cracks between light and shadow, armed with the system's versatile spy skills, he is invincible in the undercover world of this chaotic era. — Description from novelcodex.org