'Spring Fever' injects the drama with cheerful energy through the recurring 'uncle series' lines that appear every episode.

The tvN Monday-Tuesday drama 'Spring Fever' (written by Kim A-jung, directed by Park Won-guk, planned by CJ ENM STUDIOS, produced by Bon Factory), which airs every Monday and Tuesday at 8:50 p.m., is a hot pink romance of spring days that will thaw the frozen hearts of teacher Yoon Bom (Lee Joo-been), who feels chilly winds, and the man with a burning heart, Seon Jae-gyu (Ahn Bo-hyun). As of now, eight episodes have aired, and the romance between the two has ripened so much that they have been nicknamed the 'Ggyu-Bom couple,' delivering sweet thrills.

In the drama, every time Yoon Bom faces Seon Jae-gyu's unpredictable actions, she delivers the line "Uncle is ~sir?" leaving a strong impression as a key point in each episode. It serves as a device that reveals Seon Jae-gyu's character—who, despite a rough exterior, has a sense of justice and warmth—in the most intuitive yet surprising way. Viewers are looking forward to the additional fun of watching what outrageous actions Seon Jae-gyu will take to surprise people.

Episode 1 "Uncle is that person?", episode 2 "Uncle is working?", episode 3 "Uncle is dad?", episode 4 "Uncle is the youngest son of a conglomerate?", episode 5 "Uncle isn't leaving?", episode 6 "Uncle is a thief?", episode 7 "Uncle is the boss?", episode 8 "Did uncle collapse?" Each episode's impactful one-line dialogue has become 'Spring Fever's' signature, provoking laughter or delivering twists depending on the situation.

Right after the broadcast, viewers responded explosively with comments such as "The 'Uncle is ~sir?' series is so fresh and fun. It wasn't included as a line for no reason," "I watch while wondering what will come next," "Episode 6, the thief episode, really cracked me up," "Every time Bom is surprised by this line it's funny. This is the line that comes to mind when you think of this drama," and "Episode 8 was a twist because it wasn't Bom but Teacher Seo who said it."

Regarding this, the production team said, "This work is the story of Yoon Bom falling helplessly for Seon Jae-gyu's behavior, which can go anywhere. We composed the episodes hoping viewers would naturally be drawn to Seon Jae-gyu like Yoon Bom," and added, "To convey that process more entertainingly, the line that evokes the subtitle-like 'Uncle is ~sir?' came to mind," revealing the behind-the-scenes birth of the uncle series.

They continued, "Seon Jae-gyu and Yoon Bom are characters who, rather than standing still in the face of incidents, run with their own two feet to find their happiness. As characters who resolve the big and small problems of the village and grow beyond past wounds and pain, it will be part of the pleasure of enjoying the work to watch what episodes the pair will bring us through Seon Jae-gyu's outrageous actions and Yoon Bom's quick retorts of 'Uncle is ~sir?' rather than avoiding him."

Attention is focused on what episodes and scenes will complete the signature lines unique to 'Spring Fever,' which attract attention every episode.

The question is what other 'uncle series' will appear over the remaining four episodes to make viewers laugh and flutter; episode 9 of the tvN Monday-Tuesday drama 'Spring Fever' will air on Feb. 2 at 8:50 p.m.

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