tvN

Suspicious moves by the rugged country heartthrob Ahn Bo-hyun have been spotted.

In episode 4 of tvN's Monday-Tuesday drama ‘Spring Fever’ (directed by Park Won-guk / written by Kim A-jeong / planned by CJ ENM STUDIOS / produced by Bon Factory), airing at 8:50 p.m. on the 13th, Seon Jae-gyu (played by Ahn Bo-hyun) tails Yoon Bom (Lee Joo-bin) and Choi Yi-jun (Cha Seo-won), revealing his jealousy.

Earlier, Yoon Bom confirmed that the rumor that Seon Jae-gyu is Seon Han-gyeol's (Cho Jun-young) biological father was false, and, without realizing it, she felt relieved, drawing a smile. Seemingly having made up her mind toward the considerate Seon Jae-gyu, Yoon Bom took the initiative and asked him out on a date; and the ending, where after a sweet date she answered Seon Jae-gyu's question with “That's right,” melted viewers' hearts and pushed the excitement to its peak.

Meanwhile, episode 4 captures Seon Jae-gyu, Yoon Bom, and Choi Yi-jun sharing the same space, drawing attention.

Yoon Bom is chatting with Choi Yi-jun with a bright expression, and Seon Jae-gyu, whose jealousy explodes at their meeting, keeps himself hidden while focusing on their conversation. Peeking to the side with his face slightly covered by a menu, Seon Jae-gyu not only evokes laughter but also heightens curiosity about why Yoon Bom and Choi Yi-jun have met.

Choi Yi-jun, once Seon Jae-gyu's old best friend but now a sworn enemy, has resolved to take revenge on Jae-gyu after they reunited for the first time in 10 years. As he begins to act in earnest, he hints that he will come down from Seoul to Sinsu-eup, stoking curiosity. His presence creates a subtle tension between Seon Jae-gyu and Yoon Bom and is set to make the drama's love triangle even more thrilling.

A drill-sergeant moment for Seon Jae-gyu is also unveiled. With the major festival-like sports day at Sinsu High School on the horizon, Seon Jae-gyu trains with a blazing gaze as if determined never to lose. Anticipation builds for the broadcast that teases an even more exciting story, as the appearance of his rival Choi Yi-jun raises questions about what changes he will bring between Seon Jae-gyu and Yoon Bom.

Episode 4 of tvN's Monday-Tuesday drama ‘Spring Fever’ airs at 8:50 p.m. on the 13th.