In the web novel Solo Leveling, Sung Jin-Woo marries Cha Hae-In, an S-Rank hunter from the Korean Hunters Association and the only female S-Rank in South Korea. Over the course of the story, their relationship slowly deepens, starting from mutual respect and growing into genuine affection.
By the end of the novel, after the major conflicts are resolved and peace returns, Jin-Woo and Cha Hae-In get married and live a quiet, happy life together. Their bond is portrayed as both emotionally supportive and based on deep trust and shared battles.