Park Young-hee (played by Chen Shiyan) was once an excellent fencing athlete. She was born in a police family. Her father and sister are both police officers. The family feels very proud of this. One day, Park Young-hee met a man named Han Cheol-soo (played by Hong Jong-hyun). The two fell in love at first sight and soon decided to join hands in marriage. However, there is a very serious problem between the two. Han Cheol-soo's parents turned out to be well-known male and female thieves in the industry. This means that the two families are like cats and mice, and they are natural enemies. Park Young-hee's father Wanchun (played by Kim Ying-soo) strongly opposed his daughter's marriage. He always felt that the slick Han Cheol-soo was an emotional liar. In order to get the blessings of their parents, Park Young-hee and Han Cheol-soo decided to take a series of actions. Can their relationship finally come to fruition?