Others Wear Books and Become Queens, While I Act as a Licking Dog for the Male Protagonist.

Su Yingxue traveled through time and became a cannon fodder female supporting character in the book. The system asked her to influence the darkened male protagonist who was about to destroy the world. She praised him. He called her a sycophant. She protects him. He said she was a fox pretending to be a tiger. She saves him. He suspected she had ulterior motives. Until one day the system completely wiped her out. The cold male protagonist is no longer calm...