On their seventh wedding anniversary, Wu Yi finds her husband cheating and files for divorce. All the property went to her ex-husband, and he was awarded custody of their child. Wu Yi plans to fight the custodial order, but she needs a job first. Once an excellent Taekwondoin, she's hired by a security company to train to become a professional bodyguard. Her first assignment involves the guarding of the wealthy and handsome Hou Jue "Marquis" on a 24/7 basis. His cruelty has earned him many enemies, yet he will help Yi get her child back.