As she grew older, Susan's already fragile heart became more and more overwhelmed. Since she had no money to pay for the surgery, Susan knew that her life was coming to an end. In the hospital, Susan wrote letters to some patients who were emotionally unstable due to the disease and had no family members to care for them, encouraging them to be strong. The patients called her "the angel in the white wall", but no one knew Susan's true identity. Until one day, the withdrawn Cromwell walked into her life...
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