There's a hidden motive behind the invitation of the game. The ten people who got dragged to the island will be "sent" to different dimensions to save worlds.

Yenn, Byul, Jiwoon and the rest are first sent to an 'Easy mode' Arc aka a low level world as a tutorial for them. As they picked up talents and even abilities, all ten separate and was sent to different worlds by pair.

Byul and Stanley got paired up and chose an Apocalyptic theme. Both of them started to fight different kind of monsters, zombies, plants and etc.

While they gone through thick and thin, both of them naturally got feelings of attachment towards the other. However, the attachment Stanley felt for him was something deeper than he imagined.