A new behind-the-scenes video for KBS 2TV's "Police University" has been released!

Professor Yoo Dong Man (Cha Tae Hyun) has departed the school after writing a letter of resignation, according to the new making-of video. “We're filming a scenario in which we're really sad,” he says. Professor, please return. I'll do an excellent job.” Meanwhile, in the background, Yoo Young Jae and Lee Dal mock Jinyoung by imitating his acting.  Jinyoung bursts out laughing after Jinyoung and Krystal film a beautiful hug sequence together. He explains that he felt something on his shoulder move, and that it was Krystal trying to hide her smile.

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“I assumed I would confess, but Kang Hee did,” Jinyoung says when Krystal wonders how it feels to have been confessed to by Oh Kang Hee (Krystal). “Didn't you confess a lot?” Krystal asks. Didn't you? “No, you didn't.” Krystal shakes her head in disappointment as she realises Kang Sun Ho (Jinyoung) has yet to confess, and angrily repeats, “You didn't!” “Sun Ho must be quite shy,” Jinyoung observes as Krystal chuckles. Kang Hee must have been so frustrated that she came and confessed as though she was angry.” “I'm always in a fit of rage,” Krystal adds.

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While the teachers rehearse, Cha Tae Hyun and Lee Jong Hyuk spend their free time watching the Olympics. When it's the students' turn to rehearse, the young performers are animated and enthusiastic as they practise memorising their lines swiftly. Cha Tae Hyun, Lee Jong Hyuk, and Hong Soo Hyun become sidetracked while trying to swat away the bugs at the fishing grounds. Hong Soo Hyun flinches sharply, and Cha Tae Hyun reaches out to assist her, fearing that she may tumble backwards. When a mosquito lands on Hong Soo Hyun's face, the director cuts them off in the middle of filming, and Lee Jong Hyuk assists in gently swatting the mosquito away.

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While filming his action scenes with Shin Seung Hwan, Cha Tae Hyun becomes a little mischievous. During filming, the actor also flicks a grasshopper out of Jinyoung's hair. “We assumed this was the end of the case, but...” Jinyoung hints afterwards. “We'll stop here,” Yoo Young Jae says. Lee Dal responds in a last behind-the-scenes segment that the most crucial component of an inquiry is justice. He captures Jinyoung's attention, and Jinyoung concurs that fairness is the most crucial factor.