diff --git a/src/Evaluator/evaluator.cpp b/src/Evaluator/evaluator.cpp
index 78abddd..7cbc659 100644
--- a/src/Evaluator/evaluator.cpp
+++ b/src/Evaluator/evaluator.cpp
@@ -1338,17 +1338,8 @@ namespace Fig
             nullptr);
 
         evaluator.SetGlobalContext(modctx);
-        evaluator.RegisterBuiltins();
-
-        try
-        {
-            evaluator.Run(asts);
-        }
-        catch (std::exception &e)
-        {
-            std::cerr << "load module failed" << '\n';
-            throw e;
-        }
+        evaluator.RegisterBuiltinsValue();
+        evaluator.Run(asts);
 
         return evaluator.global;
     }
@@ -1356,11 +1347,16 @@ namespace Fig
     StatementResult Evaluator::evalImportSt(Ast::Import i, ContextPtr ctx)
     {
         const std::vector<FString> &pathVec = i->path;
+
+        const FString &modName = pathVec.at(pathVec.size() - 1); // pathVec at least has 1 element
+        if (modName == u8"_builtins")
+        {
+            RegisterBuiltins();
+            return StatementResult::normal();
+        }
         auto path = resolveModulePath(pathVec);
         ContextPtr modCtx = loadModule(path);
 
-        const FString &modName = pathVec.at(pathVec.size() - 1);
-
         // std::cerr << modName.toBasicString() << '\n'; DEBUG
 
         if (ctx->containsInThisScope(modName))
diff --git a/src/Evaluator/evaluator.hpp b/src/Evaluator/evaluator.hpp
index 9806dcd..c8cea2d 100644
--- a/src/Evaluator/evaluator.hpp
+++ b/src/Evaluator/evaluator.hpp
@@ -72,7 +72,7 @@ namespace Fig
                 FString(u8"<Global>"));
         }
 
-        void RegisterBuiltins()
+        void RegisterBuiltins() // only function
         {
             assert(global != nullptr);
 
@@ -87,6 +87,11 @@ namespace Fig
                     std::make_shared<Object>(f)
                 );
             }
+        }
+
+        void RegisterBuiltinsValue()
+        {
+            assert(global != nullptr);
 
             for (auto &[name, val] : Builtins::builtinValues)
             {
@@ -94,8 +99,7 @@ namespace Fig
                     name,
                     val->getTypeInfo(),
                     AccessModifier::Const,
-                    val
-                );
+                    val);
             }
         }
         /* Left-value eval*/
diff --git a/src/Module/Library/std/io/io.fig b/src/Module/Library/std/io/io.fig
index 648147d..2bfc373 100644
--- a/src/Module/Library/std/io/io.fig
+++ b/src/Module/Library/std/io/io.fig
@@ -3,7 +3,48 @@ Official Module `std.io`
 Library/std/io/io.fig
 */
 
-public func print(value) -> Null
+import _builtins;
+import noSpace; // sub module `no space print`
+
+// outputs
+
+public func print(objects...) -> Int
 {
-    __fstdout_print(value);
-}
\ No newline at end of file
+    var length := objects.length();
+    for var i:=0; i < length; i += 1
+    {
+        if i > 0
+        {
+            __fstdout_print(" ");
+        }
+        __fstdout_print(objects[i]);
+    }
+    return length;
+}
+
+public func println(objects...) -> Int
+{
+    var length := objects.length();
+    for var i:=0; i < length; i += 1
+    {
+        if i > 0
+        {
+            __fstdout_print(" ");
+        }
+        __fstdout_print(objects[i]);
+    }
+    __fstdout_print("\n");
+    return length + 1;
+}
+
+// inputs
+
+public func read() -> String
+{
+    return __fstdin_read();
+}
+
+public func readln() -> String
+{
+    return __fstdin_readln();
+}
diff --git a/src/Module/Library/std/io/noSpace.fig b/src/Module/Library/std/io/noSpace.fig
new file mode 100644
index 0000000..529ee2f
--- /dev/null
+++ b/src/Module/Library/std/io/noSpace.fig
@@ -0,0 +1,27 @@
+/*
+Official Module `std.io`
+Library/std/io/noSpaces.fig
+*/
+
+import _builtins;
+
+public func print(objects...) -> Int
+{
+    var length := objects.length();
+    for var i:=0; i < length; i += 1
+    {
+        __fstdout_print(objects[i]);
+    }
+    return length;
+}
+
+public func println(objects...) -> Int
+{
+    var length := objects.length();
+    for var i:=0; i < length; i += 1
+    {
+        __fstdout_print(objects[i]);
+    }
+    __fstdout_print("\n");
+    return length + 1;
+}
\ No newline at end of file
diff --git a/src/Module/Library/std/std.fig b/src/Module/Library/std/std.fig
index 5c707c1..c07d33c 100644
--- a/src/Module/Library/std/std.fig
+++ b/src/Module/Library/std/std.fig
@@ -3,4 +3,5 @@ Official Module `std`
 Library/std/std.fig
 */
 
-import io; // link std io
\ No newline at end of file
+import io; // link std.io
+import value; // link std.type
\ No newline at end of file
diff --git a/src/Module/Library/std/value/value.fig b/src/Module/Library/std/value/value.fig
new file mode 100644
index 0000000..0ec2cdc
--- /dev/null
+++ b/src/Module/Library/std/value/value.fig
@@ -0,0 +1,53 @@
+/*
+Official Module `std.value`
+Library/std/value/value.fig
+*/
+
+import _builtins;
+
+public func type(object: Any) -> String
+{
+    return __fvalue_type(object);
+}
+
+public func int_parse(number: String) -> Int
+{
+    return __fvalue_int_parse(number);
+}
+
+public func int_from(number: Any) -> Any
+{
+    var ntype := type(number);
+    if ntype == "Double" or ntype == "Bool"
+    {
+        return __fvalue_int_from(number);
+    }
+    if ntype == "Int"
+    {
+        return number;
+    }
+    return null;
+}
+
+public func double_parse(number: String) -> Double
+{
+    return __fvalue_double_parse(number);
+}
+
+public func double_from(number: Any) -> Any
+{
+    if ntype == "Int" or ntype == "Bool"
+    {
+        return __fvalue_double_from(number);
+    }
+    if ntype == "Double"
+    {
+        return number;
+    }
+    return null;
+}
+
+public func string_from(obj: Any) -> String
+{
+    return __fvalue_string_from(obj);
+}
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index f0613bc..b3edff6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -130,7 +130,7 @@ int main(int argc, char **argv)
 
     evaluator.SetSourcePath(sourcePath);
     evaluator.CreateGlobalContext();
-    evaluator.RegisterBuiltins();
+    evaluator.RegisterBuiltinsValue(); 
 
     try
     {