On the surface, Yan Wu Ming is a modest gentleman, a weak and irresistible doctor. But in fact, he was the commander of the Jin Wei Division of the Dark Guard Battalion. He is well aware that his job is dangerous and that he cannot involve others. So when Si Xiao Nian expressed her affection for him, he initially refused to accept it. In the end, he courageously confessed his love and decided to protect Si Xiao Nian for the rest of his life.
(Source: Chinese = Baidu || Translation and edit = ManUtiavN at MyDramaList)