Choi Su Jung, a 16-year-old senior high school student, is extremely murdered by a serial awesome. Her pal Youthful Jin gets to take a call from the killer as well as states that she'll locate and eliminate him. Over two decades later, Young Jin has actually ended up being a law enforcement officer as well as still desperately looks for the serial awesome. She has a young, middle-school-student neighbor Eun Ho. He gets stunned by what's inside Young Jin's area when he comes to her place.