The third episode of tvN's Monday-Tuesday drama "Spring Fever" aired on January 12. In this episode, the relationship between the main characters Seon Jae-gyu (played by Ahn Bo-hyun) and Yoon Bom (played by Lee Joo-bin) developed, sparking great interest among viewers. The episode recorded an average rating of 5.4% and a peak of 6.2% on paid platforms, including cable, IPTV, and satellite. In the metropolitan area, it reached an average of 4.6% and a peak of 5.5%, setting a new household rating record. Additionally, tvN's target demographic ratings for men and women aged 20-49 ranked first nationwide and in the metropolitan area across all channels, including terrestrial broadcasters, during the same time slot.

In this broadcast, Seon Jae-gyu and Yoon Bom encountered a mysterious man on the subway while searching for the runaway Choi Se-jin (played by Lee Jae-in). This man was Choi Yi-joon (played by Cha Seo-won), Seon Jae-gyu's old friend and current rival, creating tension as the two reunited after ten years. Choi Yi-joon discovered that Yoon Bom was the daughter Jung Nan-hee (played by Na Young-hee) had been looking for, raising curiosity about their intertwined stories.

Seon Jae-gyu and Yoon Bom spent a night at a hotel for Seon Han-gyeol (played by Jo Jun-young). While Seon Han-gyeol was away, the two unintentionally exercised together, maintaining eye contact. The tension escalated during this time, and Seon Jae-gyu became involved in an incident where he saved a child at the hotel swimming pool. However, his rough appearance caused a misunderstanding with the child's parents. Yoon Bom helped him, saying, "What needs to be done must be done. Once something is buried, it's hard to dig it up again."

Yoon Bom began to think that Seon Jae-gyu might be a kind and considerate person due to his unexpected side. At this point, rumors started circulating in the village that Seon Jae-gyu was Seon Han-gyeol's father. Yoon Bom felt jealousy and emotional changes after hearing from Seo Hye-sook (played by Jin Kyung) that Seon Jae-gyu had been with another woman. Later, Yoon Bom's heart wavered again when she saw Seon Jae-gyu rescue a puppy that had fallen into a drain. During this, she misunderstood that Seon Jae-gyu was Seon Han-gyeol's biological father when she saw him name the puppy "Han-gyeol."

Yoon Bom began to see Seon Jae-gyu in a new light and decided to ask him out on a date alone. Seon Jae-gyu took this as a green light and felt excited. Toward the end of the broadcast, the signals exchanged between the two became stronger, and Seon Jae-gyu became convinced that Yoon Bom liked him due to her affectionate behavior. Yoon Bom's answer, "That's right," brought cheers from viewers.

"Spring Fever" heightened viewers' anticipation with a storyline that makes them curious about how the relationship between the two main characters will develop. This drama offers viewers a pink-hued excitement and is establishing itself as a new powerhouse in Monday-Tuesday dramas.