By Danielle Braff When he was little, Eric Shin, now 41, dreamed of being a software engineer. Then, he had high hopes of performing in a top orchestra as a percussionist. Or maybe he could open a Korean restaurant, following in his parents’ footsteps. Lots of us have phantasmical ideas for the future — this first-generation Korean-American from Atlanta made all his childhood dreams a reality. Shin ran a software engineering and web design company in high school, now works as the principal percussionist of the National Symphony Orchestra, and somehow found the time to start SeoulSpice, a fast-…