When Chen Ma was young, she abandoned her youngest son, Gao Jun. Overcome with guilt in her later years, she conceals her identity and takes a job as a housekeeper in his home to atone for her past. She endures Gao Jun's coldness and unreasonable treatment, as well as her daughter-in-law's misunderstandings. She even secretly takes on extra work to help Gao Jun repay his debts. Although Gao Jun appears resistant to her presence, he is deeply moved when he discovers her secret acts of kindness and experiences her devoted care while he is ill. At last, he finally calls her 'Mom.' After Gao Jun's father discovers the truth, he drives Chen Ma away, only to be deceived out of 500,000 by a scheming new housekeeper. Gao Jun and his wife spend the money to bring Chen Ma back. After weathering numerous hardships, the family finally lets go of their grudges and truly reunites.