The heroine is bound to the "emotional value trading system", which can extract and quantify other people's emotions and conduct fair transactions. When the other person has negative emotions, she can package them into "emotional gift packages" and sell them to those who need them (for example, selling "frustration" to authors who need the protagonist to overcome tribulation, and selling "anger from departure" to singers who hold concerts). She makes a living by selling negative energy, but is surprised to find that her bamboo horse boss, Lu Hanzhou, is the only person in the entire system who produces the "full level of sweet happiness" emotion. The two started an urban game about emotional cognition and commercial cash-out around emotional trading.
