A couple who became pregnant before marriage emerged from the 28th season of "I Am Solo." On the 15th episode of SBS Plus and ENA's "I Am SOLO," an ultrasound video of the "Solo Nation 28th Baby" conceived during the show was revealed. The fetus's nickname is "Nasoli," and MC Defconn said, "Hearing the heartbeat in the ultrasound video, it sounds so full of fighting spirit. Is this the child of Kyungsoo, who has been honed by 30 years of exercise?" Lee Ik-kyung mentioned, "Could it be that Gwangsoo and Jeonghee have possibly borne a child?"

On the show, on the night of the third day, the 28th season's single men had their "second-choice dates." Youngsook went on a "2:1 date" because both Youngsoo and Gwangsoo, whom she had chosen as her first and second choices, selected her as their second choice. Youngsook asked Youngsoo, "Do you have feelings for Hyunsook too?" but Youngsoo avoided giving a direct answer. Youngsook expressed dissatisfaction, saying, "It feels like Youngsoo is talking down to all seven women." Youngsoo countered, "How can I make a decision when I just talked to Oksun and Hyunsook for the first time today?"

Youngsook questioned Youngsoo's open-mindedness, asking, "Is he speaking as if he fully understands the situation without having raised a child?" Youngsoo admitted, "I think my thoughts were short-sighted." Later, in an interview with the production team, Youngsoo confessed, "I don't have a child, so I don't think I can deeply empathize with Youngsook's feelings." Meanwhile, Gwangsoo shook his head and drew a line when asked about the possibility of a long-distance relationship with Youngsook.

After finishing dates with both men, Youngsook showed tears in front of the production team, saying, "I have to give up on my feelings for Gwangsoo. When I looked back on myself, it was Youngsoo." Jeongsook honestly said during her second-choice date with Youngho, "I avoid younger men now because they are younger." Youngho clearly stated that he had no feelings for Jeongsook.

Oksun, who dated Kyungsoo, encouraged him by saying, "Cheer up." Youngsik and Youngja deepened their affection through a deep conversation about parenting, which they had in common. Youngcheol chose Sunja as his second choice, but Sunja scolded Youngcheol and praised Sangcheol instead.

After finishing his date with Youngsook, Gwangsoo immediately called Jeonghee. Jeonghee asked Youngsook, "Did you tell him (Gwangsoo) about my feelings?" and Youngsook tearfully apologized, saying, "I made a big mistake. I'm sorry." Jeonghee asked Gwangsoo, "Have you sorted out your feelings?" and Gwangsoo expressed his intention to move forward, saying, "I think I have." Later, Gwangsoo won Jeonghee's heart through the mission "Holding Hands and Saying 'Honey'" earned from the Yutnori competition.

In an interview with the production team, Jeonghee declared, "Youngho is gone from my heart," and announced she would pursue Gwangsoo. The next morning, Hyunsook called Youngsik out of the men's dormitory and started flirting. Kyungsoo actively appealed to Youngsook, saying, "Long-distance is fine as long as it's not Mars in outer space." Youngsook responded skeptically about the long-distance situation.

Hyunsook said, "I will get to know three men from now on. Please wait," pointing to Youngsik, Youngcheol, and Gwangsoo. Sunja confessed that she had feelings for Sangcheol but hesitated because of Hyunsook. Oksun advised Sunja, "Hyunsook has already sorted out both Sangcheol and Youngsoo." Sunja immediately went to the common living room and sat next to Sangcheol, but Youngsik approached and requested a "1:1 conversation."

The production team informed the three MCs about the contestant's pregnancy news, causing a stir on set. The ultrasound video of the "28th Baby Nasoli," born during the airing of the 28th season, was revealed. Defconn speculated, "Hearing the heartbeat in the ultrasound video, it sounds so full of fighting spirit. Is this the child of Kyungsoo, who has been honed by 30 years of exercise?" Lee Ik-kyung said, "Could it be that Gwangsoo and Jeonghee have possibly borne a child?"

The 28th season of "I Am SOLO" is expected to attract intense attention until the final couple is revealed due to the news of the premarital pregnancy.