Qin Feng, the leader of the Northern Frontier Dragon Guards, codenamed "Dragon Head," possesses extraordinary skills and has a mysterious background. After leaving the military, he returns to fulfill his revered master's dying wish and travels to Jianghai City to protect Su Qingying, the CEO of Qingying Group. He intends to keep a low profile and apply for a security guard position, but an unexpected twist leads him to marry Su Qingying in a whirlwind wedding, making them a couple bound by contract. When danger strikes, he steps forward to protect his wife, her loved ones, and her family.