Ahn Bo-hyun and Cha Seo Won pulled off a once-in-a-century showdown.

On the evening of the 13th at 8:50 p.m., the tvN Monday-Tuesday drama Spring Fever (written by Kim A-jeong, directed by Park Won-guk, planned by CJ ENM STUDIOS, produced by Bon Factory) episode 4 depicted Sun Jae-gyu (Ahn Bo-hyun)'s struggle to win back Yoon Bom (Lee Joo-been)'s heart, evoking ticklish excitement and laughter at the same time. Episode 4 ratings were nationwide average 5%, peak 5.9%, Seoul metropolitan area 4.9%, peak 5.7% (based on paid platforms integrating cable, IPTV and satellite / provided by Nielsen Korea). tvN's target viewers ages 20-49 also ranked No. 1 across all channels including terrestrial networks in the same time slot nationwide, clearly asserting its presence as a Monday-Tuesday powerhouse.

In that episode, the past between Sun Jae-gyu and Yoon Bom, who had been one of those fleeting connections, was revealed and captured attention. A year earlier, in a lonely situation where she was mistaken by parents as the other woman in an affair and even her family would not believe her, Sun Jae-gyu was the only one who held Yoon Bom's hand. Yoon Bom expressed gratitude, saying, "I thought about why I keep being drawn to Mr. Sun Jae-gyu. I think it's because of a feeling of debt in my unconscious toward that side." But when Sun Jae-gyu showed curiosity about her wounds, Yoon Bom drew a line, asking him not to take any more interest, adding to the poignancy.

Afterward, Sun Jae-gyu showed his hurt, but he soon fought hard to win Yoon Bom's heart back. After hearing from Seo Hye-sook (Jin Kyung) that bees had gotten into Yoon Bom's house, Sun Jae-gyu wrapped himself up tightly and visited her home, transforming into the youngest son of Yoon Bom's unique "beehive" and bringing laughter. His all-purpose moments, such as removing the beehive and cutting down a tree, provided fresh amusement.

As Yoon Bom became more entangled with Choi Yi-jun (Cha Seo Won), Sun Jae-gyu's attention increasingly turned toward her. He secretly watched meetings between Choi Yi-jun and Yoon Bom and, comparing Choi Yi-jun's behavior—markedly different from his own—he unleashed his jealousy.

Then Shinsoo High School's major festival, the sports day, was held. Sun Jae-gyu and Choi Yi-jun became rivals as representatives of the blue team and white team respectively, each acting as parents of Sun Han-gyeol (Cho Junyoung) and Choi Se-jin (Lee Jaein), piquing viewers' interest. The two showed sincere commitment to the sports day in their own ways. Upon learning that Yoon Bom was on the white team, Sun Jae-gyu transformed into a one-day instructor to give her a victory medal, launching extreme physical training with the white team students including his nephew Sun Han-gyeol. Meanwhile, Choi Yi-jun added humor by conducting the pre-event briefing and providing snacks to boost the students' morale.

Before the sports day curtain rose, Sun Jae-gyu learned through Sun Han-gyeol that Yoon Bom had been forcibly moved to the blue team by Vice Principal Hong Jung-pyo (Oh Man-seok), leaving him stunned. His attitude, which had been urging unity among the white team students, changed in an instant. Sun Jae-gyu even declared he would not participate in the sports day. However, it was revealed that Yoon Bom's true team was the white team, delivering a twist. With Yoon Bom's rousing cry, "White team, are you ready to win?" the sports day officially began, heightening anticipation for the next episode.

Episode 5 of the tvN Monday-Tuesday drama Spring Fever will air on the 19th at 8:50 p.m.

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