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She is a gold medal killer in the 21st century. Unexpectedly, she was separated from her family during an assassination mission. She traveled to the good-for-nothing Fifth Miss of the Yun Mansion and lived a new life. She came with a system that defied the heavens and had countless treasures, but she offended him, a charming and flirtatious man. Let's see how they continue their love affair with each other...