During the Song Dynasty, the codename "Tianren" was once a legend that frightened the international mercenary community. He was unrestrained and unrestrained, and regarded life and death as nothing, until he was rescued by Xie Yunqing, a gentle and gentle Médecins Sans Frontières, during a mission that required death. Xie Yunqing used his scalpel-wielding hands to sew up Song Shi's broken body, and also used gentleness and tolerance to soothe the hostility all over his body. Song Shi chose to retire and remain anonymous, just to protect this only "weak spot".
However, the calm was broken. Xie Yunqing's research institution was attacked by mysterious forces and all data was destroyed. Xie Yunqing was listed as the number one suspect and was forced to flee. Song Shi firmly believed in his lover's innocence and vowed to find out the mastermind behind the scenes. But he soon discovered that all the clues pointed to the one person he trusted most - his old comrade-in-arms and now the intelligence dealer "K".
As the investigation deepened, Song Shi found that he had fallen into an elaborate scam. Every intelligence support, every danger saved, may be a trap set by "K" to control him. Trust collapses inch by inch in lies. Song Shi must distinguish truth from lies in a hail of bullets, and make the cruelest choice between the friendship between former brothers and the life and death of his lover.
