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S1 E2: Li Xintong is emotionally close to her sister Carmen. When Carmen was in Japan, she fell prey to a love scam and so was depressed, took her life, leaving Xintong devastated. Years later, Xintong joined a special web PR company Shadow, which helps their client deal with online problems, such as cyber bullying, online falsehood etc. The company is set up by Huo Junhao, a smart and mysterious guy.