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This is a Korean version of Don Den Lover Vol. 1 - Shiro Kuro Tsukeyo!. Here are the changes from Japanese version:
No 'clock set' option in the dips switches menu.
Haruka Takahashi is known as Ji-Yuon-Park.
Megumi Unazuki is known as Dami-Kim.
Mika Minazuki is known as Seong-Young-Lee.
Izumi Katou is known as A-Young-Ser.
Hitomi Ikenohata is known as Da-Hea-Kim.