Three years ago, Ling Chen, codenamed "Hidden Dragon", was a top agent who frightened international terrorist organizations. However, he was seriously injured in an "accidental" mission and retired. He took the pseudonym "Old Chen" and lived in seclusion in the old streets of the city. He made a living by opening a hardware store and kept his unique skills in the dust.
Until one rainy night, he accidentally rescued Su Qingyuan, the president of Qianyi Group, who was being hunted by a killer. This seemingly fragile woman was actually the "Nightingale" liaison who secretly guarded the country's technological secrets. The strange totem left by the pursuer is exactly the same as the "accident" of Ling Chen's mission that year, and the dust-laden memories are instantly awakened.
The former king of secret agents is forced to return to the battlefield: he can defuse bombs with one hand like solving a Rubik's Cube, he can spot the flaws of undercover agents with his micro-expressions, he can use street tools to create deadly traps, and he can move between skyscrapers and slums. Faced with the siege of mercenary legions, the calculations of hidden clans, and the infiltration of foreign forces, Ling Chen protected his lover with his left hand and his family and country with his right hand, setting off a shocking secret war as a mortal.
When Su Qingyuan discovered that the "hardware store owner" next to her was actually the "uncle hero" in her childhood picture album; when the hidden traitor showed his fangs, and when the international conspiracy pointed directly at the hinterland of China - Ling Chen finally stopped hiding, the hidden dragon came out of the abyss, and the blood debt was repaid with blood!
"I am retired, but I will not fade away. Anyone who offends China will be punished no matter how far away he is!"
