On December 29, Dahyun was spotted at Gimpo Airport leaving for Japan for overseas schedule.

As you can see in the video below, the airport staff showed Dahyun’s passport towards the cameras and fans (2:42).
the way dahyun was SHOCKED that this lady really just aired her whole damn business out like that. LET me find out her name. about to call the airport myself. hello may i speak to a fucking manager pic.twitter.com/MUYBABv830
— destiny (@daahyuns) December 29, 2019
The airport staff was sloppy while checking Dahyun’s passport. TWICE said in one of their vlives that fans were able to call them because they saw their numbers from airport pics when a glimpsed of their personal infos was taken usually when their passports are being check
— mica ?. #HappySANAday ? (@chibikkorapper) December 29, 2019
There was an employee at the airport that clearly didnt took enough care to protect private passport info. Anyone there with a good camera could have taken a picture of her private information. This is unprofessional behaviour and Dahyun was visibly pissed. @JYPETWICE pic.twitter.com/k4r06p6kuZ
— Icarus (@M2RROR) December 29, 2019