Out Of The World Game System

Sean finally plays the most dangerous game ever without considering the fact that if he fail a mission, he will die
Sean's sister, Trina, has a PS game she is used to playing. One day, she got absorbed by this game which later caught a Virus and will be shut down. Abnormally, Trina was transmigrated from her game to Sean's mission.
Sean was surprised when he got a notification from the system
[Mission Intrusion]
[Abnormally, another player joined this mission! Mission level increased tremendously]
[You and the player are bound as one player by the system, Your game level increased]