The original work is completed in one go, the feelings are sincere, and there is no slack at all. This change is really a mess. It has nothing to do with the name and has to apply the story line of the original book. The ending was changed just for a sequel.
The comics are all about the theme of home, and Cha Hyun-soo accepts that his desire is to have a warm home and a happy life. Protecting the people you want to protect and completing the redemption of yourself. The ending of the manga is really a sublimation of the theme.
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