Heroine: Su Tangqing, the legitimate daughter of the Su Mansion, a scholarly family in Suzhou, is proficient in Kunqu opera, calligraphy and painting, and received traditional education since childhood but has hidden new ideas. When she was 19 years old, her family was in ruins (her father was unjustly imprisoned for being involved in a warlord financial case, and her family property was confiscated). She fell from the clouds into the mud, but relied on resilience to find a way in troubled times - first taught at Shanghai Women's Middle School, then devoted herself to helping children in need during the war, and finally became a battlefield medical volunteer. She grew from a "delicate lady" to a "female woman of the Republic of China with bones and souls."
• Twin brothers:
◦ Shen Yanci (brother): On the surface, he is a surgeon at Shanghai Renji Hospital. He is as gentle as jade and treats others with humility. His sleeves always smell of disinfectant. In fact, he is an underground intelligence worker, secretly delivering medical supplies and frontline intelligence to progressive organizations. Habitually hiding her emotions behind the lenses, Su Tangqing's guardianship was a "moisturizing and silent" companionship - providing her with a place to stay when she was living in Shanghai, staying in bed all night when she was infected with cold, but never saying a transgressive word.
◦ Shen Yanzhao (brother): A young marshal during the Beiyang warlord period, he later joined the Anti-Japanese Army as a regimental commander. He had a fierce and unruly personality, superb riding skills, and always wore a saber left by his father on his waist. He looks cold and hard, but actually hides his softness - because he witnessed his mother being persecuted by warlords in his childhood, he has an obsession with "protection". When he first met Su Tangqing at the Suzhou dock, she was harassed by gangsters. He came on horseback and crushed the gangster's knife with his military boots. He left behind a sentence: "How dare you touch the members of the Shen family" (at that time, he mistakenly recognized Su Tangqing as the daughter of his father's old subordinates). From then on, his protection was a "brazen charge", delivering medicine to her after breaking through the Japanese blockade, and protecting her on the battlefield.
