"From what I read, they finally get their happy ending in a side story, reuniting the pained love birds after 6 years of separation."
Where is the happy ending in the book version? What side story did you mean please?
I just read the book translated by https://polychromaticprosetearsinheaven.wordpress.com/ , and it had a very sad and depressing ending.
They're not together, he sent her away to another country to have the baby alone, and they agreed to never see each other again. His baby will never learn who his father is and he will never see his baby. He also mentioned to her that he will marry someone else in the future, and she said she will always be alone, never marrying and having other babies. He loved her, but she didnt love him at all. This ending seemed final, since he also threw alway the ring he wouldve given his love that his nanny was saving for him, and sweet momentos into the lake.
I'm so annoyed that I wasted my time and read it lol, because i thought it would also have a happy ending like the drama. I'll never read a book by this author again lol!
If you plan to read that translated book, expect a very sad ending. (unless this happy ending is written some where else, and it wasnt included. If you know where it can be read in English, PLEASE let me know so I can have some closure! :) ).