This novel was called " Cannon Fodder: I'm the Villain's Lackey ". The male protagonist, Xiao Mobai, felt heartache when he felt that the female protagonist, Jiang Wanwan, was in danger. Even if she was injured, it would make the female protagonist feel pain. The female lead transmigrated into a cannon fodder, so she had an inexplicable connection with the original villain. The two of them got married, and Jiang Wanwan kept being Xiao Mobai's lackey in order to protect him. As a result, feelings developed between the two of them. I hope you like my recommendation.