By Shivam Das | October 12, 2026
The newest behind-the-scenes video for tvN’s 100 Days of Deception gives viewers something a polished teaser cannot: a look at the easy, sometimes chaotic teamwork behind the drama’s tense spy-romance premise. In coverage published October 12, Soompi reports that Kim You-jung and Park Jinyoung repeatedly broke into laughter during filming, forgot lines, and shared playful dances between takes. The footage also shows Kim You-jung performing pickpocketing scenes and helping crew members, while Park Jinyoung jokes about his action work.
What the new making-of video shows
The behind-the-scenes clip begins with Kim You-jung in pickpocketing scenes. She jokes that her work has earned the cost of an after-work dinner, according to Soompi’s report. The small exchange fits the character she plays: Lee Ga-kyeong is introduced as a resourceful thief whose skills pull her into a dangerous undercover assignment in Japanese-occupied Gyeongseong.
The video also captures a warmer side of the production. Kim You-jung is shown helping staff, prompting playful teasing from people on set. These unscripted moments do not prove how every scene was made, but they offer a glimpse of the collaborative atmosphere around the cast.
Park Jinyoung mixes action with comedy
Park Jinyoung’s portion of the making-of footage balances action work with self-deprecating humor. Soompi reports that he jokes about using a wave-like movement to avoid a bullet. Co-star Jin Sun-kyu also keeps him laughing, turning a demanding set day into a lighter exchange.
The contrast matters for a drama built around deception, political danger, and shifting loyalties. On screen, the leads’ characters must question what the other person says; off screen, the new footage gives fans a lighter way to get to know the performers behind those roles. That is a useful promotional angle, but it should not be mistaken for evidence that the actors’ real-life relationship mirrors the romance in the story.
Why fans are watching the cast between takes
Behind-the-scenes clips often work because they provide context without revealing major plot turns. Here, the most shareable moments are small: a forgotten line, an unexpected laugh, or a dance between takes. They invite viewers to notice the cast’s timing and comfort with one another without spoiling the espionage story.
Watch related official video coverage
For readers who want a related video featuring the cast, the embedded press-conference footage below is separate from the new making-of clip. The making-of report and its original video are available through Soompi’s coverage.
Read Soompi’s original report on the October 12 making-of video.
What the footage does—and does not—tell us
The new clip supports a straightforward conclusion: the actors are sharing playful moments during production, and those moments are giving fans extra material to enjoy between episodes. It does not establish private relationships, guarantee future story developments, or confirm any audience-rating trend. Those claims require separate evidence.
Frequently asked questions
What is shown in the new 100 Days of Deception behind-the-scenes video?
According to Soompi’s October 12 report, the clip includes Kim You-jung’s pickpocketing scenes, her interactions with crew members, Park Jinyoung’s action work, and moments when the actors laugh or dance between takes.
Why are Kim You-jung and Park Jinyoung laughing on set?
The report describes them forgetting lines, struggling to hold back laughter, and sharing playful dances during filming. These are moments from the production footage, not evidence about their private lives.
Who is Jin Sun-kyu in the making-of footage?
Jin Sun-kyu appears alongside Park Jinyoung and jokes with him during filming, according to the report.
Where can I read the original coverage?
Read the Soompi report published October 12, 2026 for the reported details and original video.
Reporting note: This article summarizes publicly reported promotional footage and links to source coverage. Photo sources and license information should be checked before reuse; only the Wikimedia Commons image above is explicitly credited here under CC BY 4.0.
