Personality~
For the most part, Seven displays a happy-go-lucky, outgoing, and very bizarre personality. He frequently plays pranks on Yoosung via chat room, makes fun of the other members (and himself), and, in response to just about anything, will respond with a series of "lol"s. He's essentially your typical jokester who loves cars (he owns multiple) and holds a passion for hacking.

However, the player's first impression of Seven is not the "real" Seven. Outside the chatroom, and behind the humorous front he puts up, Seven is actually quite depressed and serious, and he refuses to believe that anything good can happen to him. This is due to his past and his profession, as he thinks that he will endanger anyone he gets close to. This fear is brought up very often during the events of his route, usually when he is trying to push the player away.

Voice~

Voice Clip: https://youtu.be/xdnj6WWbpVI
A happy-go-lucky and slightly bubbly voice would fit Saeyoung.