Interstellar General Store

In the vast expanse of the stars, I'm just a small-time general store owner! "What? You want weapons? Nope, nope. I'm a general store, not an armory." Lin Hai turned away a customer. "What? The Bugs are attacking? No problem, here's some beast-taming rice balls. Problem solved!" Lin Hai pulled out ten rice balls and handed them to the customer. "Huh! Looks like they've evolved to a high level. No problem-Degeneration Lamp, degrade them back to single-celled organisms!" Lin Hai confronted the insectoid leader alone. Who am I? Just a small-time general store merchant. Don't mess with me, or you'll regret it!