Flirting with the Third Female Lead Behind the System's Back

Blurb One:

Jiang Yisheng transmigrated into the body of a "vicious supporting actress." According to the plot, she was supposed to fight the female lead to the death, but instead she fell for Bai Chu, the best friend of her "love rival."

Bai Chu was close to the female lead and had always been hostile toward Jiang Yisheng. In her eyes, every time Jiang Yisheng approached her, it was for some ulterior motive:

Jiang Yisheng didn't like Bai Chu always spending time with the female lead, so she would seize every chance to draw Bai Chu to her side. Bai Chu thought she was trying to isolate the female lead...

Jiang Yisheng brought breakfast for her and the female lead while she was out running an errand. Bai Chu thought she was up to no good...

Just as Jiang Yisheng finally managed to melt Bai Chu's heart and earn a little of her favor, the System began forcing her to get in the way of the male and female leads.

At a banquet, Bai Chu was happily chatting with someone when she turned and saw Jiang Yisheng in a red dress, intimately linking arms with the male lead.

Bai Chu's gaze lingered for just a moment before returning to normal, but the fingertips gripping her wineglass gradually turned white. After the banquet, Jiang Yisheng came trotting over again, calling her "Big Sister" over and over. Bai Chu's expression was cold. She furrowed her brow slightly and said, "Jiang Yisheng, sometimes I really can't make sense of you."

Blurb Two:

Jiang Yisheng was lying in Bai Chu's arms, tracing her lower lip with a fingertip and softly coaxing her to say sweet nothings. Then the System ordered her to go ruin the male and female leads' date again. Jiang Yisheng gazed tenderly at Bai Chu, unable to bear leaving her. No matter how the System shocked her, she held Bai Chu even tighter, her eyes red with pain.

"Why do you feel all tingly?" Bai Chu asked softly.

"Don't talk." With a sob in her voice, Jiang Yisheng kissed her and guided Bai Chu's hand beneath the front of her clothes...

Blurb Three:

"This is her last chance," the System told Jiang Yisheng.

"What if I still don't succeed this time?" Jiang Yisheng asked, trembling.

"Death."

"How dare you?" Jiang Yisheng's eyes were bloodshot as she clenched her teeth. "How dare you treat Bai Chu like this?"

"It has nothing to do with me. Everything that happened was the result of her own choices," the System replied coldly. "But this time, she chose to live."

Theme: No one is an NPC.