diff --git a/gnovm/stdlibs/testing/fuzzing/fuzz_hasher.gno b/gnovm/stdlibs/testing/fuzzing/fuzz_hasher.gno
index a667554cce8..8492b0c19f8 100644
--- a/gnovm/stdlibs/testing/fuzzing/fuzz_hasher.gno
+++ b/gnovm/stdlibs/testing/fuzzing/fuzz_hasher.gno
@@ -30,9 +30,10 @@ type (
 	}
 )
 
-// ----------------------------------------
-// FuzzHasher: main struct
-// ----------------------------------------
+// FuzzHasher is the main struct for managing hash mappings.
+//
+// It maintains mappings between hash numbers, internal hashes, and coverage data.
+// The struct includes a counter for assigning unique hash numbers.
 type FuzzHasher struct {
 	HashNumber2Internal     *[MaxCapacity]InternalHash  // Table: hashNumber -> internalHash
 	internal2Cov            map[InternalHash]Coverage   // Table: internalHash -> Coverage
@@ -42,14 +43,15 @@ type FuzzHasher struct {
 	// coverageCache map[string]hashNumber  // coverage -> hashNumber
 }
 
-// ----------------------------------------
-// registerCoverage2HashNumber
-// ----------------------------------------
-// 1) computes internalHash from coverage
-// 2) inserts coverage into internal2Cov
-// 3) obtains hashNumber (unique ID)
-// 4) updates hashNumber2Internal
-// 5) returns the assigned hashNumber
+// RegisterCoverage2HashNumber computes an internal hash from the given coverage,
+// stores the mapping, assigns a unique hash number, and updates the internal tables.
+//
+// It performs the following steps:
+// 1. Computes the internal hash from the coverage.
+// 2. Inserts the coverage into internal2Cov.
+// 3. Obtains a unique hash number.
+// 4. Updates HashNumber2Internal.
+// 5. Returns the assigned hash number.
 func (fh *FuzzHasher) RegisterCoverage2HashNumber(coverage Coverage) HashNumber {
 	ih := GetInternalHash(coverage) // compute internalHash
 	fh.internal2Cov[ih] = coverage
@@ -111,7 +113,7 @@ func (fh *FuzzHasher) countHashNumber(ih InternalHash) HashNumber {
 	return current
 }
 
-// IsExistingCoverage는 주어진 coverage가 이미 등록되어 있는지 확인하여, 등록되어 있으면 true, 아니면 false를 반환합니다.
+// IsExistingCoverage checks whether the given coverage is already registered.
 func (fh *FuzzHasher) IsExistingCoverage(cv Coverage) bool {
 	ih := GetInternalHash(cv)
 	_, exists := fh.internal2Cov[ih]
diff --git a/gnovm/stdlibs/testing/fuzzing/fuzz_logger.gno b/gnovm/stdlibs/testing/fuzzing/fuzz_logger.gno
index ff0dbe4f2f4..f2b4029c4ba 100644
--- a/gnovm/stdlibs/testing/fuzzing/fuzz_logger.gno
+++ b/gnovm/stdlibs/testing/fuzzing/fuzz_logger.gno
@@ -90,12 +90,11 @@ func TokenizeXXX(s interface{}) []Token {
 	var tokens []Token
 	var b []byte
 
-	// 입력 타입 체크
 	switch v := s.(type) {
 	case string:
-		b = []byte(v) // string을 []byte로 변환
+		b = []byte(v)
 	case []byte:
-		b = v // []byte 그대로 사용
+		b = v
 	default:
 		panic("unsupported type: must be string or []byte")
 	}
diff --git a/gnovm/stdlibs/testing/fuzzing/mutator.gno b/gnovm/stdlibs/testing/fuzzing/mutator.gno
index 73ee469e127..5d8201cf8e8 100644
--- a/gnovm/stdlibs/testing/fuzzing/mutator.gno
+++ b/gnovm/stdlibs/testing/fuzzing/mutator.gno
@@ -765,7 +765,7 @@ func NewMutSample(seed Seed) *MutSample {
 		Seed:                 seed,
 		ArgPowerSetScores:    scores,
 		SamplePopularity:     1,
-		RootEntsDict:         formattedRootEntsDict, // arg idx와 Ent매핑
+		RootEntsDict:         formattedRootEntsDict,
 		NotSbEntsDict:        formattedNotSbEntsDict,
 		CachedPowerSetCumSum: nil, // Cache starts empty
 		NeedsUpdateCache:     true,
@@ -890,7 +890,7 @@ var entMutators = map[MutationCode]MutateFunc{
 	CHP:   changePattern,
 	IR:    insertRandomly,
 	IG:    insertGradual,
-	II:    insertInteresting, // 수정된 이름
+	II:    insertInteresting,
 	IP:    insertPattern,
 	SW:    swap,
 	PKL:   preserveKindLight,
diff --git a/gnovm/stdlibs/testing/fuzzing/parser_for_not_sb.gno b/gnovm/stdlibs/testing/fuzzing/parser_for_not_sb.gno
index 5d7542f4b49..bd3a62446dd 100644
--- a/gnovm/stdlibs/testing/fuzzing/parser_for_not_sb.gno
+++ b/gnovm/stdlibs/testing/fuzzing/parser_for_not_sb.gno
@@ -162,7 +162,6 @@ func quickSortMutationCodesForNotSB(keys []MutationCodeForNotSB) {
 	}
 	pivotIndex := len(keys) / 2
 	pivot := keys[pivotIndex]
-	// 피벗을 마지막 요소와 교환합니다.
 	keys[pivotIndex], keys[len(keys)-1] = keys[len(keys)-1], keys[pivotIndex]
 
 	storeIndex := 0
@@ -172,7 +171,6 @@ func quickSortMutationCodesForNotSB(keys []MutationCodeForNotSB) {
 			storeIndex++
 		}
 	}
-	// 피벗을 올바른 위치로 이동합니다.
 	keys[storeIndex], keys[len(keys)-1] = keys[len(keys)-1], keys[storeIndex]
 
 	quickSortMutationCodesForNotSB(keys[:storeIndex])
diff --git a/gnovm/stdlibs/testing/fuzzing/parser_test.gno b/gnovm/stdlibs/testing/fuzzing/parser_test.gno
index 9b8e57f19e2..4f92fe4f40e 100644
--- a/gnovm/stdlibs/testing/fuzzing/parser_test.gno
+++ b/gnovm/stdlibs/testing/fuzzing/parser_test.gno
@@ -127,7 +127,7 @@ func TestMutateArg(t *testing.T) {
 	ms := fuzzing.NewMutSample(seed)
 
 	for idx, original := range seed.Content {
-		t.Logf("원본 인자 [idx=%d]: %v", idx, original)
+		t.Logf("original args [idx=%d]: %v", idx, original)
 		for iter := 0; iter < 5; iter++ {
 			mutatedArg, mutationInfo := ms.MutateArg(original, 3, idx)
 			t.Logf("  Iteration %d: mutated value: %v, mutation info: %+v", iter, mutatedArg, mutationInfo)
@@ -135,9 +135,7 @@ func TestMutateArg(t *testing.T) {
 	}
 
 	keys, cum := ms.Seed.HashNumber, []uint64{0}
-	t.Logf("MutSample 내부 전략 캐시 (예시): keys=%v, cum=%v", keys, cum)
-
-	fmt.Println("테스트가 완료되었습니다.")
+	t.Logf("MutSample's strategy cache (example): keys=%v, cum=%v", keys, cum)
 }
 
 // TestSort tests boundary-based selection logic for mappedGeneratingNumber.