A modern special forces soldier accidentally time-travels, returning to the year 1982, and transforms into a lazybones despised by everyone in the village. His family is dirt poor, leaving only two sisters depending on each other. Carrying his special forces skills, he picks up a slingshot and steps into the deep mountains, searching for mountain goods and harvesting prey, going up the mountain to make a living and down the mountain to sell. Along the way, storms are endless and crises are heavy. Standing firm against criticism, relying on courage and ability, he protects the sisters, turns the poor family around, and carves out his own good days in the 1980s.