Becoming a killer requires three conditions: a commission, a target, and a reward. A single girl believes that people also need three reasons to live, but life is too hard. She has to take care of her demented mother, run the store to support her family, and be forced to sell her body. The wheelchair man lacks self-confidence and depends on his father for life. He longs for the tenderness of the opposite sex, but even calling a prostitute is rejected, so he can only hide in the disabled toilet to masturbate. Can we, who are both wanderers in the world, help each other? Dear killer, can you kill the source of pain? Qiu Siqin, who was born as a child star, played a tragic character and broke through the past image. Zheng Renshuo, who has challenged different roles in recent years, plays a vulnerable force with lower limb paralysis, showing his acting skills again.