diff --git a/README.md b/README.md
index 8680075..42f66af 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,41 @@
 # Logging with color and format string
 
+## Usage
+
+```go
+import (
+    "kumoly.io/lib/klog"
+)
+
+func main() {
+    Lklog.EVEL = Lerror | Ldebug | Lwarn | Linfo
+	klog.PROD = false
+    klog.Info("Hello, world.")
+    klog.Error("Error, world.")
+
+    // create sub logger
+    log := klog.Sub("me")
+    log.Warn("log with me")
+
+    // print fields
+    log.InfoF(klog.H{"Key":"value"}, "other ", "stuffs.")
+
+    // intercepting logs
+    p := log.GetPrinter()
+	log.SetPrinter(func(w io.Writer, d *Ldata, l *Logger) {
+		d.Message += " intercepted"
+
+        // NOT IN HERE
+        // as it will cause infinate loop
+        // p := log.GetPrinter()
+		
+        p(w, d, l)
+	})
+
+    
+}
+```
+
 ## Test
 
 Mem: `go test -o tests/test.exe -memprofile tests/mem && go tool pprof -http : tests/mem`
@@ -21,4 +57,12 @@ BenchmarkDefault-8         12410            109143 ns/op
 BenchmarkSub1-8            10000            113340 ns/op
 BenchmarkDefault-8         12186            112974 ns/op           21944 B/op        303 allocs/op
 BenchmarkSub1-8            10000            114026 ns/op           22702 B/op        363 allocs/op
+
+v0.0.4
+goos: linux
+goarch: amd64
+pkg: kumoly.io/lib/klog
+cpu: AMD Ryzen 9 5900X 12-Core Processor            
+BenchmarkDefault-12        24697             47673 ns/op           21337 B/op        291 allocs/op
+BenchmarkSub1-12           22639             52841 ns/op           22103 B/op        351 allocs/op
 ```
\ No newline at end of file
diff --git a/color.go b/color.go
index 6fe6049..325e806 100644
--- a/color.go
+++ b/color.go
@@ -3,11 +3,9 @@ package klog
 import (
 	"fmt"
 	"strconv"
-
-	"kumoly.io/lib/klog/color"
 )
 
-func (l *Logger) M(s interface{}, attrs ...color.Attribute) string {
+func (l *Logger) M(s interface{}, attrs ...Attribute) string {
 	if !l.color {
 		return fmt.Sprint(s)
 	}
@@ -23,3 +21,67 @@ func (l *Logger) M(s interface{}, attrs ...color.Attribute) string {
 	}
 	return fmt.Sprintf("\033[%sm%s\033[0m", styles, s)
 }
+
+type Attribute int
+
+// Base attributes
+const (
+	Reset Attribute = iota
+	Bold
+	Faint
+	Italic
+	Underline
+	BlinkSlow
+	BlinkRapid
+	ReverseVideo
+	Concealed
+	CrossedOut
+)
+
+// Foreground text colors
+const (
+	FgBlack Attribute = iota + 30
+	FgRed
+	FgGreen
+	FgYellow
+	FgBlue
+	FgMagenta
+	FgCyan
+	FgWhite
+)
+
+// Foreground Hi-Intensity text colors
+const (
+	FgHiBlack Attribute = iota + 90
+	FgHiRed
+	FgHiGreen
+	FgHiYellow
+	FgHiBlue
+	FgHiMagenta
+	FgHiCyan
+	FgHiWhite
+)
+
+// Background text colors
+const (
+	BgBlack Attribute = iota + 40
+	BgRed
+	BgGreen
+	BgYellow
+	BgBlue
+	BgMagenta
+	BgCyan
+	BgWhite
+)
+
+// Background Hi-Intensity text colors
+const (
+	BgHiBlack Attribute = iota + 100
+	BgHiRed
+	BgHiGreen
+	BgHiYellow
+	BgHiBlue
+	BgHiMagenta
+	BgHiCyan
+	BgHiWhite
+)
diff --git a/color/color.go b/color/color.go
deleted file mode 100644
index 343c733..0000000
--- a/color/color.go
+++ /dev/null
@@ -1,65 +0,0 @@
-package color
-
-type Attribute int
-
-// Base attributes
-const (
-	Reset Attribute = iota
-	Bold
-	Faint
-	Italic
-	Underline
-	BlinkSlow
-	BlinkRapid
-	ReverseVideo
-	Concealed
-	CrossedOut
-)
-
-// Foreground text colors
-const (
-	FgBlack Attribute = iota + 30
-	FgRed
-	FgGreen
-	FgYellow
-	FgBlue
-	FgMagenta
-	FgCyan
-	FgWhite
-)
-
-// Foreground Hi-Intensity text colors
-const (
-	FgHiBlack Attribute = iota + 90
-	FgHiRed
-	FgHiGreen
-	FgHiYellow
-	FgHiBlue
-	FgHiMagenta
-	FgHiCyan
-	FgHiWhite
-)
-
-// Background text colors
-const (
-	BgBlack Attribute = iota + 40
-	BgRed
-	BgGreen
-	BgYellow
-	BgBlue
-	BgMagenta
-	BgCyan
-	BgWhite
-)
-
-// Background Hi-Intensity text colors
-const (
-	BgHiBlack Attribute = iota + 100
-	BgHiRed
-	BgHiGreen
-	BgHiYellow
-	BgHiBlue
-	BgHiMagenta
-	BgHiCyan
-	BgHiWhite
-)
diff --git a/log.go b/log.go
index 9813eb9..917408c 100644
--- a/log.go
+++ b/log.go
@@ -9,7 +9,6 @@ import (
 	"time"
 
 	"github.com/mattn/go-isatty"
-	"kumoly.io/lib/klog/color"
 )
 
 type Llevel int
@@ -76,21 +75,21 @@ func DefaultPrinter() Printer {
 		}
 		switch d.Level {
 		case Lerror:
-			level = l.M("ERROR", color.FgHiRed)
+			level = l.M("ERROR", FgHiRed)
 			caller = d.Caller
 		case Ldebug:
-			level = l.M("DEBUG", color.FgHiMagenta)
+			level = l.M("DEBUG", FgHiMagenta)
 			caller = d.Caller
 		case Lwarn:
-			level = l.M("WARN ", color.FgHiYellow)
+			level = l.M("WARN ", FgHiYellow)
 		case Linfo:
-			level = l.M("INFO ", color.FgHiBlue)
+			level = l.M("INFO ", FgHiBlue)
 		}
 		_, err := fmt.Fprintf(w, "%s [%s]%s%s %s%s\n%s",
 			d.Time.Format("2006/01/02 15:04:05"),
-			level, l.M(sys, color.FgHiCyan),
-			caller, l.M(d.Message, color.FgHiGreen), fields,
-			l.M(d.Stack, color.FgRed),
+			level, l.M(sys, FgHiCyan),
+			caller, l.M(d.Message, FgHiGreen), fields,
+			l.M(d.Stack, FgRed),
 		)
 		if err != nil {
 			fmt.Println(err)
@@ -201,6 +200,10 @@ func (l *Logger) SetOutputAll(out io.Writer) {
 	}
 }
 
+func (l *Logger) GetPrinter() Printer {
+	return l.printer
+}
+
 func (l *Logger) SetPrinter(p Printer) {
 	l.printer = p
 }
diff --git a/log_test.go b/log_test.go
index f425099..12b90ee 100644
--- a/log_test.go
+++ b/log_test.go
@@ -4,8 +4,6 @@ import (
 	"io"
 	"os"
 	"testing"
-
-	c "kumoly.io/lib/klog/color"
 )
 
 func TestDev(t *testing.T) {
@@ -63,9 +61,9 @@ func TestSubProd(t *testing.T) {
 
 func TestColoring(t *testing.T) {
 	l := Sub("color")
-	l.Error(l.M("Hello", c.BgHiGreen, c.Italic, c.FgWhite), ", ", l.M("world", c.FgBlue, c.BgHiYellow))
-	l.Error(l.M("Hello", c.FgHiGreen), ", ", l.M("world", c.Underline, c.FgMagenta))
-	Error(M("Hello", c.FgHiGreen), ", ", M("world", c.Underline, c.FgMagenta))
+	l.Error(l.M("Hello", BgHiGreen, Italic, FgWhite), ", ", l.M("world", FgBlue, BgHiYellow))
+	l.Error(l.M("Hello", FgHiGreen), ", ", l.M("world", Underline, FgMagenta))
+	Error(M("Hello", FgHiGreen), ", ", M("world", Underline, FgMagenta))
 }
 
 func TestToFile(t *testing.T) {
@@ -173,3 +171,14 @@ func BenchmarkSub1(b *testing.B) {
 		l.WarnF(H{"test": "fields"}, "err in", "BenchmarkSub1: ", i)
 	}
 }
+
+func TestIntercept(t *testing.T) {
+	l := Sub("inter")
+	l.Info("original")
+	p := l.GetPrinter()
+	l.SetPrinter(func(w io.Writer, d *Ldata, l *Logger) {
+		d.Message += " intercepted"
+		p(w, d, l)
+	})
+	l.Info("original")
+}
diff --git a/std.go b/std.go
index 5070be7..19e8846 100644
--- a/std.go
+++ b/std.go
@@ -2,8 +2,6 @@ package klog
 
 import (
 	"io"
-
-	"kumoly.io/lib/klog/color"
 )
 
 var std = New("")
@@ -13,7 +11,11 @@ func DefaultLogger() *Logger {
 }
 
 func SetPrinter(p Printer) {
-	std.printer = p
+	std.SetPrinter(p)
+}
+
+func GetPrinter() Printer {
+	return std.GetPrinter()
 }
 
 func SetPrinterAll(p Printer) {
@@ -22,7 +24,7 @@ func SetPrinterAll(p Printer) {
 	}
 }
 
-func M(s interface{}, attrs ...color.Attribute) string {
+func M(s interface{}, attrs ...Attribute) string {
 	return std.M(s, attrs...)
 }