As a physics professor of Northwest University, Mr. Dai meets some difficult with his son, student, and wife. At the last paragraph of his life, a series of softhearted stories happened.As a physics professor of Northwest University, Mr. Dai meets some difficult with his son, student, and wife. At the last paragraph of his life, a series of softhearted stories happened.As a physics professor of Northwest University, Mr. Dai meets some difficult with his son, student, and wife. At the last paragraph of his life, a series of softhearted stories happened.