In Yuxiang, Shanghai in the 20th year of the Republic of China, she is a daughter of a traditional Chinese medicine family who fled with her ancestral medical books, and he is the inspector of the concession who hides a secret. When they first met, he was seeking medical treatment for an informant who had been poisoned by snake venom. She took out a silver needle stained with begonia petals from the medicine box. The moment her fingertips touched, the rain was wrapped with warmth.
He shielded her from the warlord's search, and she prepared the decoction for him to heal his old wounds. The begonia flowers on the window sill withered and bloomed again, and feelings spread quietly in the fragrance of the medicine and the smoke of gunpowder. But when the family's blood feud comes to light, and when his identity is revealed, should the silver hairpin with each other's names be engraved on it, stab it at the enemy, or pierce it into the heart?
"Dr. Su, in this troubled world, I can't protect my country. I can only protect every kindness in your medicine box."
