Shen Changgeng accidentally travels back to ancient times, where his parents mysteriously disappear, leaving him and three young siblings to rely on each other for survival. His oldest uncle's family covets their family property, repeatedly harassing and coercing them. Bearing the burden of supporting the family, Shen Changgeng uses his modern life experience to forage for mountain goods and work hard, safeguarding his siblings' food and safety. Along the way, he accidentally discovers old letters and tokens left by the older generation, getting entangled in an old mystery. Remaining true to his original intentions, he treats others with deep loyalty, gathers clues, and calmly handles various crises. While striving to improve his family's life, he explores the truth behind his parents' disappearance, growing tenaciously in a difficult environment and striving to protect his relatives and kind people around him.