Hyun-dong is a hikikomori. He lives off of the joy of assembling and displaying Gundams in his only space, his home. Then one day, he makes a big decision to go out to buy a Gundam plastic model that a delivery man left next to his door. At that moment, the front door slams shut. He is trapped in an unfamiliar world, he can't remember the password and he decides to go on a long journey to find the key house.
Ryu Jun-yeol
Hyun Dong
Gwon Hyeokil
Courier 1
Lee Kyungjin
Courier 2
Kim Yunyoung
Security Guard
Lee Minji
Student
Mun Enok
Young Hyun Dong
Lee Hyeonha
Child 1
Lee Sangmin
Child 2
Lee Kyungjin
High school student 1
Han Hoseong
High school student 2
Kim Hwanmyeong
High school student 3
Ju Kihun
Shop owner
