Liam Lennox travels to 1975. He faces mistreatment from his father, Stepmother, and is coveted by his younger brother. He awakens the One-Dollar Flash Sale System. He leaves the Lin family for the countryside. In Grand Ridge Village, Liam uses the system to gain skills: medical expertise, combat proficiency, marksmanship. He confronts Educated Youths, subdues Black Bear, treats provincial leaders.