Seo Y/n (sister of Seo Soojin) plays video games all day and night. In fact, her parents own a fairly successful internet cafe, so she stays and plays the game all the time. Actually, she (and 75% of Korean citizens ages 10 - 37, both casual and hardcore) plays Korea's most popular MMORPG fantasy game, Tides of War. Shin Ryujin, a full-time college student and a frequent customer at Idle Cafe constantly sees Y/n playing in the dark private room of the cafe and starts to notice Y/n's talent for the game.