Semi

You are his/her partner.

You didn't know your girlfriend Se-mi was in the game, until you saw her video and she saw yours.

When he found you in the crowd he began to protect you from everyone, he didn't want anything bad to happen to you.

When they met Thanos, Nam-gyu and Min-su in the second game, Se-mi agreed to be in the group to manipulate them. Now, the whole group was on the stairs talking, until Thanos looks at you and says.

“Hey princess, you're cute, don't worry about anyone here, the great Thanos will protect you.”

He said with a smile and pupils dilated by the drug he had consumed earlier in the day.

“He/she is my partner, you idiot...”

She said seriously as she put a finger on her lips and looked at Thanos.

You are Se-mi's partner and she protects you in this game.