The movie "The Most Beautiful Goodbye in the World" is adapted from the original novel and TV series of the same name by Korean writer Lu Xiqing. Lu Xiqing wrote this novel because she missed her mother who died of cancer. The novel depicts the life of an ordinary and great mother. The mother (played by Bae Jong-ok) took care of her mother-in-law for 15 years after she suffered from Alzheimer's disease. She took on the burden of the family alone and worked hard for the family. The husband (played by Kim Kap-soo) didn't care about family affairs at all. The daughter fell in love with a married man, and the son was also facing a difficult situation in the college entrance examination. Everyone in the family seemed to have their own troubles and their own things. She went to the hospital where her husband worked for treatment, but her husband didn't want to see her at work because he was a low-paid doctor; she went to see her daughter at work and wanted to ask her to have lunch together, even if it was just a simple bowl of udon noodles, but her daughter was busy dating her lover and refused her; her distressed son was admitted to the university and relaxed, dating and drinking with his girlfriend, and living his own happy life. But at this time, she was diagnosed with bladder cancer and was in the terminal stage of cancer. When they found out their mother was about to die, everyone in the family's attitude changed...