After the Sickly Bride Faked Her Death and Took Her Sister's Place, the Whole Family Regretted It

[Regret arc / devoted to each other, both strong / clear-headed heroine / marriage first, love later] Lin Wantang was frail from birth, and a master predicted she wouldn't live past twenty. Her family loved her dearly, and her childhood sweetheart and fiance was devoted to her. Everyone envied her good fortune. Song Congwen searched everywhere for a way to prolong her life, but after finding a living medicine whose blood could save her, he fell in love with the medicine. Under its influence, her family even accepted it as their adopted daughter. As her family and fiance grew distant, Lin Wantang neither cried nor made a scene. She turned around, entered the palace, and volunteered to marry in another bride's place for a political alliance, protecting peace throughout the land as a warrior bride. On her wedding day, her fiance married the living medicine. After faking her death, she passed him in a princess's bridal sedan on her way to the alliance marriage. When her family learned she was dead, they bitterly regretted their actions and knelt before her memorial day and night in repentance. After the marriage, Lin Wantang intended to give her life for her country, but the legendary cold and violent king kept her locked in his arms night after night. The man gripped her chin and, possessive and domineering, traced her lips with his own blood. His voice turned feverish as he said, "Wantang, I'll give you my blood, my heart, and even the whole world. Will you have them?" When the nations came to pay tribute, her former fiance saw the peerlessly beautiful woman beside the cruel king. His heart broke, his eyes reddened with regret, and he went mad...