Two hostile killer forces in the world are facing each other tit for tat. Ji Jingxiao and Mu Xiaoran, each under the orders of their leaders Zhi Yiqi and Qi Yu'an, conceal their true identities and sneak into the international police station. They are bent on lurking just to uncover their old enemies. They have no idea that the person they are facing each other day and night is the target of their efforts to track down.
The two worked together in the police station and fought side by side through life and death several times. They had a secret affection for each other day and night, and secretly held affection in their hearts. In private, they still secretly tracked the trail of the rival killer, without suspecting each other or the people around them.
A dangerous anti-drug operation suddenly broke out. Ji Jingxiao sacrificed his life to protect Mu Xiaoran in desperation. Unfortunately, he was shot and seriously injured and was hospitalized. His sharp and ruthless stealth skills accidentally exposed his flaws, making the calm-minded Mu Xiaoran suspicious. He originally wanted to settle the grudge while the other party was recovering from illness, but the tender feelings of being together in the past flooded his heart, and he finally couldn't bear to give up.
When Ji Jing Xiaoxiao recovered and returned to the team, the old tacit understanding between partners was still lingering, and suspicions had already arisen. Since then, the two have been testing each other step by step, hiding their edge. Under the warmth of the past, the positions of good and evil have quietly confronted each other with the fate of hostility.
Intention: Even though we are enemies by fate, we still feel emotional; we have different paths but still feel attached to each other.