Chen Jin's obsession in this life is Shen Yan; Su Yun's preference in this life is Su Shi.
Two pairs of unrelated stepbrothers hide a shady love and a secret that the four of them cling to.
They had agreed under the old locust tree that they would watch each other day and night, but in the end they plunged into the abyss of drug investigation - Shen Yan, Chen Jin, and Su Xi became undercover agents on the tip of the knife, protecting Su Yun who was most in pain behind them, and allowing him to be a psychiatrist in peace.
Every step in the abyss is a mountain of knives. Su Xie committed suicide due to an accident and left a secret message to hide his love for half his life. Shen Yan and Chen Jin were captured and tortured, humiliating and corroding their bones. Drug addiction gnawed at their souls, but they held on to the information and refused to let go.
They used bones as paper and blood as ink, carving the righteousness of their family and country into their flesh and blood, and finally embraced each other and died without any bones left.
Su Yun, who understands people's hearts best, couldn't save himself after all, and went crazy next to the empty old locust tree.
The drug lords were eliminated, and the country was peaceful and the people were at peace. But in the peace they had sacrificed their lives for, no one remembered their merits, only the shady love and abuse.
The sweetness in the fragrance of the locust flowers that year was the only warmth in my life; for the rest of my life, there were only embers and bones, no way back, no condolences, and no one dared to read their names.
Intention: The mountains and rivers are safe because of loyalty, love cannot be tolerated because it is foolishness and vulgarity