Once a prestigious lineage of poison and hidden weapons, the Sichuan Tang Family has now fallen into decline. Born there, Tang Yeon-myeong suddenly becomes obsessed with sword, awakening memories of his past life where he reached the pinnacle of swordsmanship. "In this life, I want to live quietly." To live quietly, I must hide my swordsmanship skills. However, there are too many obstacles hindering me.