diff --git a/src/yycc/rust/panic.cpp b/src/yycc/rust/panic.cpp
index 01bb8eb..5d7bb36 100644
--- a/src/yycc/rust/panic.cpp
+++ b/src/yycc/rust/panic.cpp
@@ -1,21 +1,23 @@
 #include "panic.hpp"
-
+#include "../carton/termcolor.hpp"
+#include "../string/reinterpret.hpp"
 #include <cstdlib>
 #include <iomanip>
 #include <iostream>
 #include <stacktrace>
 
+#define TERMCOLOR ::yycc::carton::termcolor
+#define REINTERPRET ::yycc::string::reinterpret
+
 namespace yycc::rust::panic {
 
     void panic(const char* file, int line, const std::string_view& msg) {
         // Output message in stderr.
         auto& dst = std::cerr;
 
-        // TODO: Fix colorful output when finishing `termcolor` lib.
-
         // Print error message if we support it.
-        // // Setup color
-        // dst << FOREGROUND<Color::Red>;
+        // Setup color
+        dst << REINTERPRET::as_ordinary_view(TERMCOLOR::foreground(TERMCOLOR::Color::Red));
         // File name and line number message
         dst << "program paniked at " << std::quoted(file) << ":Ln" << line << std::endl;
         // User custom message
@@ -23,8 +25,8 @@ namespace yycc::rust::panic {
         // Stacktrace message if we support it.
         dst << "stacktrace: " << std::endl;
         dst << std::stacktrace::current() << std::endl;
-        // // Restore color
-        // dst << RESET;
+        // Restore color
+        dst << REINTERPRET::as_ordinary_view(TERMCOLOR::reset());;
 
         // Make sure all messages are flushed into screen.
         dst.flush();
diff --git a/testbench/yycc/carton/wcwidth.cpp b/testbench/yycc/carton/wcwidth.cpp
index ddaeebb..39591b1 100644
--- a/testbench/yycc/carton/wcwidth.cpp
+++ b/testbench/yycc/carton/wcwidth.cpp
@@ -1,8 +1,10 @@
 #include <gtest/gtest.h>
 #include <yycc.hpp>
 #include <yycc/carton/wcwidth.hpp>
+#include <yycc/carton/termcolor.hpp>
 
 #define WCWDITH ::yycc::carton::wcwidth
+#define TERMCOLOR ::yycc::carton::termcolor
 
 namespace yycctest::carton::wcwidth {
 
@@ -43,10 +45,10 @@ namespace yycctest::carton::wcwidth {
     }
 
     TEST(CartonWcwdith, Termcolor) {
-        // TODO: Fix this after finish "termcolor".
-        // assert_eq!(wcswidth(&colored("abc", Color::Red, Default::default(), Default::default())), 3);
-        // assert_eq!(wcswidth(&colored("中文", Color::Red, Default::default(), Default::default())), 4);
-        // assert_eq!(wcswidth(&colored("ありがとう", Color::Red, Default::default(), Default::default())), 10);
+        using Color = TERMCOLOR::Color;
+        TEST_SUCCESS(TERMCOLOR::colored(u8"abc", Color::Red), 3);
+        TEST_SUCCESS(TERMCOLOR::colored(u8"中文", Color::Red), 4);
+        TEST_SUCCESS(TERMCOLOR::colored(u8"ありがとう", Color::Red), 10);
     }
 
 } // namespace yycctest::carton::wcwidth