By Shivam Das · October 12, 2026
The best behind-the-scenes moments do more than show actors smiling between takes. They reveal how a drama builds rhythm and trust before those qualities reach the screen. In the latest making-of footage for tvN’s 100 Days of Deception, Kim You-jung and Park Jin-young share the lighter side of a story shaped by espionage, danger and life under Japanese colonial rule.
What the new behind-the-scenes video shows
According to Soompi’s October 12 report, the making-of video opens with Kim You-jung filming pickpocketing scenes as Lee Ga-kyeong. She jokes about having earned enough to cover the cast and crew’s after-work dinner, then helps members of the production team. The exchange gives the set a relaxed atmosphere without losing sight of the coordination required for a period drama.
Park Jin-young also gets a chance to show his action work. He jokes about moving like a wave to dodge a bullet, while co-star Jin Sun-kyu keeps the mood light with teasing remarks. Soompi reports that Kim You-jung and Park Jin-young repeatedly make each other laugh, sometimes losing their lines and sharing silly dances during filming. These are specific glimpses of a comfortable working dynamic, rather than proof of sweeping claims about the cast.
Why these lighter moments matter to a spy romance
100 Days of Deception follows Lee Ga-kyeong, a skilled pickpocket who becomes an undercover operative for the Korean independence movement and infiltrates the Japanese Government-General in Gyeongseong, present-day Seoul. There she becomes entangled with interpreter Kim Tae-woong, also known as Sato Hideo, played by Park Jin-young. The story’s central tension depends on concealed identities and uncertain loyalties, making the contrast between off-camera playfulness and on-screen guarded behavior particularly interesting.
Behind-the-scenes footage cannot prove that two performers will have convincing on-screen chemistry, and a cheerful set does not guarantee a successful drama. It can, however, help viewers understand the teamwork behind choreographed scenes. Pickpocketing, action sequences and period blocking all require timing; a cast that communicates comfortably may find it easier to adjust when a scene needs another take.
The characters still have serious stakes
The warmth shown between takes should not be confused with the tone of the story itself. Lee Ga-kyeong’s cover identity places her inside a dangerous colonial administration, while Kim Tae-woong’s public position and personal history make his loyalties difficult to read. The drama uses romance as one strand of a larger story about secrecy, survival and the cost of resisting an oppressive system.
That context is why viewers should be cautious with viral captions that turn a short clip into a sweeping claim. The footage supports the modest conclusion that the lead actors appear relaxed and playful while filming. It does not establish that the actors are dating, that the production is free of conflict, or that audience ratings will rise because of one making-of video.
Watch the making-of video
The clip is the clearest way to judge the cast’s on-set dynamic for yourself. This YouTube player is linked from Soompi’s report. If it is unavailable in your region, consult the original coverage linked below.
For the original social post about the drama’s episode preview, visit tvN Drama on X. The official account is preferable to reposted clips without clear provenance.
What viewers should take away
The most useful takeaway from this making-of is not an exaggerated promise about the drama’s future. It is a glimpse of how the cast balances demanding scenes with humor between takes. Kim You-jung’s physical pickpocketing work, Park Jin-young’s action beats and Jin Sun-kyu’s teasing offer small, concrete details that make the production feel more tangible.
For viewers deciding whether to try 100 Days of Deception, the clip is an appealing extra, while the series itself will have to earn its reputation through storytelling, performances and pacing. The contrast between the actors’ easy laughter off camera and their characters’ complicated secrets is a promising ingredient—not proof of a guaranteed hit.
Frequently asked questions
What does the new behind-the-scenes video show?
It shows Kim You-jung filming pickpocketing scenes, helping the crew and joking with colleagues. Park Jin-young performs action work and shares playful moments with co-stars, according to Soompi’s October 12 report.
Who stars in 100 Days of Deception?
The principal cast includes Kim You-jung, Park Jin-young and Kim Hyun-joo, with Lee Moo-saeng and Jin Sun-kyu among the supporting cast.
Does the video prove Kim You-jung and Park Jin-young are dating?
No. The footage shows friendly on-set interactions. It is not evidence of a real-life romantic relationship.
Where can I find the original report?
Read Soompi’s behind-the-scenes coverage and visit the official Netflix title page for series information.
