Jungsook and Sangcheol from SBS Plus and ENA's variety show "I am SOLO" Season 28 attracted attention by announcing their premarital pregnancy. On the 12th, the two revealed a photo together on Jungsook's personal SNS, showing a tender moment. Jungsook posted the photo with the caption, "Sangcheol♥Jungsook. Thank you for the beautiful hair and makeup." In the released photo, Sangcheol looked neat wearing a white shirt with a navy suit and tie, while Jungsook exuded pure charm with her long black hair and smile.

During the broadcast of "I am SOLO," Jungsook and Sangcheol's premarital pregnancy was revealed. The program saw the formation of six couples, setting a record for the most couples ever. In particular, the news of Jungsook and Sangcheol's pregnancy surprised many. In the episode aired on the 12th, the ending showed six couples—Youngsoo and Jungsook, Youngho and Oksun, Youngchul and Youngja, Sangcheol and Sunja, Kwangsoo and Junghui, Kyungsoo and Oksun—choosing each other.

During the show, Jungsook had an honest conversation with Youngsoo on a "Super Date." She said, "Are you the same outside as you are now? I immediately stopped the advances from the single men, but you didn't. If women tempt you, wouldn't you easily give in?" Youngsoo replied, "I unintentionally had many one-on-many dates, and I was stressed too." Jungsook emphasized, "I want someone responsible no matter what when I meet someone new."

Youngsoo promised to make a final choice with Jungsook but also struggled with his relationship with Hyunsook. Hyunsook consulted Youngchul about her relationship with Youngsoo, and Youngchul advised her not to trust Youngsoo's words. Kyungsoo showed tears of empathy while talking about parenting during a "Super Date" with Youngsook.

Jungsook tried to use the "Super Date Pass" with Sangcheol but was interrupted by Sunja. Sunja teased Sangcheol, saying, "He seems like an easy man." Sangcheol expressed displeasure and warned, "You should stop that." After an awkward conversation, the two returned to their respective rooms.

On the final choice day, Youngsoo enjoyed breakfast with Jungsook and decided to continue their relationship. Meanwhile, Hyunsook left disappointed after Youngsoo chose Jungsook. In the final selection, Youngsoo and Jungsook chose each other and became a couple, and Sangcheol and Sunja, Youngchul and Youngja, Kwangsoo and Junghui, Kyungsoo and Youngsook also paired up as couples.

Jungsook and Sangcheol were noted as the first premarital pregnancy couple in "I am SOLO" Season 28. Jungsook explained the development of their relationship, saying, "We ended up having a full group reunion." Currently, Jungsook is pregnant, and the due date is known to be May 7 of next year. The wedding is planned to take place before the birth.

This broadcast attracted great interest from viewers as several couples were formed besides Sangcheol and Jungsook. The MCs sent congratulatory messages regarding the pregnancy news of the two after the show. Jungsook and Sangcheol announced a new beginning as parents of a baby with the nickname "Nasoli."