Bok Choy Doenjang Muchim (청경채 무침)

1 pound bok choy
1 garlic clove, minced
1 green onion, minced
2 tablespoons doenjang (fermented soybean paste)
2 teaspoons gochujang (hot pepper paste)
a pinch of sugar
2 teaspoons sesame oil
2 teaspoons sesame seeds