This is flip phone game by SK Telecom and Widerthan.com released only in South Korea, 닷핵 사인 is a single player turn-based RPG game made for NATE mobile phones.
Webzen
Bandai Namco Entertainment Korea
Role-playing (RPG), Turn-based strategy (TBS), Adventure
Legacy Mobile Device
Bird view / Isometric, Text
Legacy Mobile Device - Apr 06, 2004
.hack//SIGN SK Telecom (Stylized title)
.Hack
Project .Hack, .Hack
