Sam is an Avenger, the new Captain America after Steve left. Sam has been on an undercover mission, but got in to deep. Hes dating the target's sister, they've been dating for a year and she don't know hes an Avenger nor that this is all for his mission.

Sam accidentally fell in love with her and they live in an apartment together, he asked her to stop going all the time with her brother, Sam's target, so she did as he asked.

But she found out, shes not happy.