Lee Gyeong-suk — a mother who spent her entire life sacrificing everything for her family. She was the very symbol of devotion, yet her son Seo Min-wook never once managed to say “thank you.” After his mother passes away, Min-wook lives consumed by regret — until an unbelievable miracle sends him back in time, into the body of his maternal uncle Lee Dong-ho on the very day the family’s tragedy began. Lee Dong-ho. A man who trampled over his family’s dreams and hopes, swallowed up their entire wealth, and left everything in ruins. Returned to the past, Min-wook resolves to set things right — but is met with questions that only deepen over time. “If only our family can avoid this rain that falls on the whole world… would that truly be enough to satisfy me?” Can his choices to redeem the past make his mother truly happy? The story of sacrifice, regret, and redemption begins now!