Hyung-Woo then mistakenly text messages his itinerary to his mother instead of Eun-Jae. When Hyung-Woo and Eun-Jae arrive at the airport they find Hyung-Woo's mother there as well, believing she was invited to their trip to Japan.
Hyung-Woo accidentally texted his travel plans to his mom instead of his girlfriend, Eun-Jae.  Upon arriving at the airport, they discover Hyung-Woo's mother is also present, mistakenly believing she had been invited on their trip to Japan.