There is a mute doctor Su Wuyin at the Forgotten River Ferry. He can use herbal medicine to relieve human ailments, but he can't cure his own mute disease. He also has a peculiar quirk - he only heals people who "cross the river with injuries". One day, Prince Lu Jingyuan of Dayin, who was seriously injured and unconscious, was abandoned at a ferry. Su Wuyin made an exception to save him, but when changing the dressing, she discovered that the birthmark on his waist was exactly the same as the "masked general" who massacred her family ten years ago. While using herbal medicine to slow down his injuries, she secretly investigated the truth. However, as they got along day and night, she saw his tenderness towards the refugees and his weariness with the imperial power. She also discovered that there was a conspiracy of the royal family to seize the heir behind the family extermination case.
