Jihyo’s most significant and only fully confirmed romantic storyline was her relationship with , which became public in August 2019.

Jihyo contributed to writing the lyrics for TWICE’s Cactus (a song about unrequited love) and Celebrate . In Celebrate , the lyrics reflect a deep, committed love that has survived hardships. While the song is for fans, the emotional weight she carries while singing it suggests she pours her real romantic experiences into her art.

As of 2022, Jihyo's relationship status remained a mystery. Fans had been eagerly awaiting updates on her love life, but she had kept her personal life private. In a recent interview, Jihyo had hinted that she was focusing on her music and self-care, stating that she was "happy and content" with her life.

The report revealed that the two had been seeing each other for about four months before the news broke. Their relationship reportedly blossomed after Kang Daniel appeared as a guest host on a music show where Twice was performing. A mutual acquaintance described them as “two young, hardworking artists who found comfort in each other.”

In early 2024, rumors began to swirl again. Reports emerged suggesting that Jihyo had been dating Yun Sung-bin, an Olympic gold medalist in skeleton racing and a popular figure from the physical reality show Physical: 100. While JYP Entertainment maintained a neutral stance, stating they could not confirm details regarding their artist’s private life, the "storyline" among fans became one of admiration. Many noted that both Jihyo and Yun share a passion for fitness and a disciplined lifestyle, making them a "power couple" in the eyes of the public.