Third Party Change scene back and forth by Pun

I am building a training game, then the players will be instantiated at the beginning of the game. I have a task that a player has to drive a car then that player would be transformed to another scene and do the task alone. When he finishes the task he will be back to the original scene with others. My problem here is whenever I put him back, there another clone will be created and he cannot see another player while another player still sees him. Btw, how do you guys manage multiple scenes while using PUN, how to save player data when moving to another scene?