Returning to the game

Hi guys, i leave the game just after the sara s+ event, i dont understand somethings i thats why im here asking:

Which skin events i lost

Which are the new characters (i know that i dont have iris, haneun (youngsup friend), and the guy with the earphones) how can i get them ?(i didnt saw them in the scout store)

What is coming now? I just watched something about a red hair mb is an s+?

Ty all