Lu Yiran, an illegitimate daughter, takes the initiative to approach Luan Lian, a steady and composed military serviceman, and proposes a contractual flash marriage to escape the marriage alliance arranged by the Lu family. What begins as a marriage of convenience in which they help each other get what they want gradually changes as they spend their days together after the wedding. As they join forces time and again to fight off the Lu family and deal with the entanglements caused by Cheng Xiao and Lu Sui, Yiran and Lian slowly lower their defenses, fall for each other, and turn their unfamiliar contractual marriage into a mutual journey of love that begins after marriage.