The protagonist Liu Xinyan, a modern high school girl, admires her class math teacher, Zhan He. Due to the teacher's majesty, she dare not express her admiration to her teacher. He could only work hard to improve his mathematics to attract the teacher's attention. This move aroused strong dissatisfaction from Fa Xiao. Later, by chance, all three of them traveled back in time to ancient times, and she became the son of a general. During a war when she became an adult, she met a teacher who also had this time-travel memory, and they became friends. Fa Xiao protected him all his life, and also protected her after time travel and helped her become a general.
