Growing up as a child in Korea, this dish was one of the regulars in my home-packed school lunches (dosirak/bento) which usually consisted of rice and a few side dishes. I like it braised, but you can omit braising and simply pour the sauce over the pan-fried tofu.
Pat the tofu dry with a paper towel. Heat the oil in a large, nonstick skillet over medium heat. Carefully add the tofu pieces (tofu breaks easily) and sear until light golden brown, about 4-5 minutes on each side.
Meanwhile, prepare the sauce by mixing all of the remaining ingredients together. Spoon the sauce over the tofu pieces and around the sides of the pan. Simmer for 4-5 minutes over medium-low heat. Flip them over and simmer for 1-2 more minutes.