Su-ji and U-ri

Now, I Don't Exist In His World (1x122)

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Na-young finds out about Hyun-sung's dissociative amnesia and learns that he doesn't even remember her. Jang-soo tells her that Hyun-sung would never accept her back after what she did and advises her to give up and get a divorce, but she returns to Haedeul Hospital to see Hyun-sung again.