"He Who is Dangerous to Me" tells the story of Shen Man Ning who, because of an unexpected kidnapping case, discovers Zhuang Xin Yan. After Zhuang Xin Yan dies, the powerful and mysterious Yan Xing Cheng forces Shen Man Ning to start her "second life" as his fiancé. As they overcome adversities and difficulties together the two go from being completely hostile with one another to slowly joining hands, learning to love and rely on each other. Together they discover the truth of the unsolved case from 17 years ago.