The ace killer "Blood Shadow" of the world's number one killer organization "Shadow", died with the organization and was accidentally reborn into Qiao Ying, a senior high school student in Yuncheng. The original owner, Qiao Ying, has low self-esteem, poor grades, and poor grades. She has been treated harshly and ostracized by her classmates for a long time. After rebirth, Qiao Ying quickly adapted to her new identity. While changing her appearance, she dealt with the provocateurs and protected her only sister, Qiao Yi, who was kind to her original owner. And accidentally rescued Qin Hanyue, the leader of the Qin family. The two gradually formed a subtle connection during the confrontation. On the road of revenge, Qiao Ying gradually uncovered more secrets about the organization's conspiracy. In the end, the shadow is destroyed, the blood feud is avenged, and the life story is revealed.
