Reiner was a childhood friend of (F/N), along with Bertholdt. He'd do anything for her - Even pay for expensive concerts. Though, his plan for a cute, romantic evening had failed as her popularity grew.
Devastated, he was. But, (F/N) meant the world to him. To see her smile was good enough. However (F/N) and Reiner didn't account for falling in love with a star. That was not a plan for either of them.