diff --git a/data/uking_functions.csv b/data/uking_functions.csv
index dded5f3a..22875bca 100644
--- a/data/uking_functions.csv
+++ b/data/uking_functions.csv
@@ -89516,10 +89516,10 @@
 0x00000071011bbc0c,BaseProcHandle::wakeUpActorAndReleaseUnit,184,
 0x00000071011bbcc4,BaseProcHandle::getBaseProcEvent,48,
 0x00000071011bbcf4,BaseProcHandle::allocUnit,228,
-0x00000071011bbdd8,BaseProcUnit::setActor,540,
+0x00000071011bbdd8,BaseProcUnit::setActor,540,_ZN4ksys3act12BaseProcUnit7setProcEPNS0_8BaseProcE
 0x00000071011bbff4,BaseProcUnit::cleanUp,512,
 0x00000071011bc1f4,BaseProcUnit::unlinkActor,412,
-0x00000071011bc390,BaseProcUnit::isParentHandleDefault,24,
+0x00000071011bc390,BaseProcUnit::isParentHandleDefault,24,_ZNK4ksys3act12BaseProcUnit21isParentHandleDefaultEv
 0x00000071011bc3a8,sub_71011BC3A8,132,
 0x00000071011bc42c,sub_71011BC42C,56,
 0x00000071011bc464,sinitBaseProcHandle,172,
diff --git a/src/KingSystem/ActorSystem/actBaseProc.h b/src/KingSystem/ActorSystem/actBaseProc.h
index 1c9aa7cc..0411b834 100644
--- a/src/KingSystem/ActorSystem/actBaseProc.h
+++ b/src/KingSystem/ActorSystem/actBaseProc.h
@@ -11,6 +11,7 @@
 #include <thread/seadAtomic.h>
 #include "KingSystem/ActorSystem/actBaseProcJob.h"
 #include "KingSystem/ActorSystem/actBaseProcMap.h"
+#include "KingSystem/ActorSystem/actBaseProcHandle.h"
 #include "KingSystem/Utils/StrTreeMap.h"
 #include "KingSystem/Utils/Types.h"
 
@@ -23,17 +24,7 @@ class BaseProc;
 class BaseProcLinkData;
 class BaseProcJobHandler;
 class BaseProcUnit;
-
-class BaseProcHandle {
-public:
-    BaseProcHandle();
-    ~BaseProcHandle();
-
-private:
-    BaseProcUnit* mUnit;
-    u8 mFlag;
-};
-KSYS_CHECK_SIZE_NX150(BaseProcHandle, 0x10);
+class BaseProcHandle;
 
 /// Actor base class that encapsulates all the low-level actor lifetime logic.
 class BaseProc {
@@ -100,6 +91,7 @@ public:
         return mState == State::Delete || mStateFlags.isOn(StateFlags::RequestDelete);
     }
 
+    bool isInitialized() const { return mFlags.isOn(Flags::Initialized); }
     /// For BaseProcLink or ActorLinkConstDataAccess.
     bool acquire(ActorLinkConstDataAccess& accessor);
     BaseProcLinkData* getBaseProcLinkData() const { return mBaseProcLinkData; }
diff --git a/src/KingSystem/ActorSystem/actBaseProcHandle.cpp b/src/KingSystem/ActorSystem/actBaseProcHandle.cpp
new file mode 100644
index 00000000..e69de29b
diff --git a/src/KingSystem/ActorSystem/actBaseProcHandle.h b/src/KingSystem/ActorSystem/actBaseProcHandle.h
new file mode 100644
index 00000000..031e9923
--- /dev/null
+++ b/src/KingSystem/ActorSystem/actBaseProcHandle.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <basis/seadTypes.h>
+#include "actBaseProcUnit.h"
+#include "KingSystem/Utils/Types.h"
+
+namespace ksys::act {
+
+class BaseProcUnit;
+
+class BaseProcHandle {
+public:
+    BaseProcHandle();
+    ~BaseProcHandle();
+
+    static BaseProcHandle sDummyBaseProcHandle;
+private:
+    BaseProcUnit* mUnit;
+    u8 mFlag;
+};
+KSYS_CHECK_SIZE_NX150(BaseProcHandle, 0x10);
+
+}  // namespace ksys::act
\ No newline at end of file
diff --git a/src/KingSystem/ActorSystem/actBaseProcUnit.cpp b/src/KingSystem/ActorSystem/actBaseProcUnit.cpp
index e69de29b..8f8b3919 100644
--- a/src/KingSystem/ActorSystem/actBaseProcUnit.cpp
+++ b/src/KingSystem/ActorSystem/actBaseProcUnit.cpp
@@ -0,0 +1,57 @@
+#include "KingSystem/ActorSystem/actBaseProcUnit.h"
+#include <prim/seadSafeString.h>
+#include <prim/seadScopedLock.h>
+#include "KingSystem/ActorSystem/actActorLinkConstDataAccess.h"
+#include "KingSystem/ActorSystem/actBaseProc.h"
+#include "KingSystem/Utils/Debug.h"
+namespace ksys::act {
+
+// NON_MATCHING: Equivalent but branches are off.
+bool BaseProcUnit::setProc(BaseProc* proc) {
+    bool ret;
+    static constexpr const char* sStateNames[] = {"Init", "Calc", "Sleep", "Delete"};
+
+    auto lock = sead::makeScopedLock(mCS);
+    if (mProc)
+        mProc = nullptr;
+
+    if (mHandle == &BaseProcHandle::sDummyBaseProcHandle)
+        return false;
+
+    if (mHandle) {
+        if (mFlags != 1) {
+            sead::FixedSafeString<64> message;
+
+            if (proc)
+                message.format("%s, %d, %d, %s, ( %p:%p )", proc->getName().cstr(), mFlags,
+                               proc->isInitialized(), sStateNames[u8(proc->getState())], this,
+                               mHandle.load());
+            else
+                message.format("なし, %d, ?, ?, ( %p:%p )", mFlags, this, mHandle.load());
+
+            util::PrintDebug(message);
+        }
+        mProc = proc;
+        mFlags = 2;
+        ret = true;
+    } else {
+        sead::FixedSafeString<64> message;
+
+        if (proc)
+            message.format("%s, %d, %d, %s, ( %p:%p )", proc->getName().cstr(), mFlags,
+                           proc->isInitialized(), sStateNames[u8(proc->getState())], this,
+                           mHandle.load());
+        else
+            message.format("なし, %d, ?, ?, ( %p:%p )", mFlags, this, mHandle.load());
+
+        util::PrintDebug(message);
+        ret = false;
+    }
+    return ret;
+}
+
+bool BaseProcUnit::isParentHandleDefault() const {
+    return mHandle == &BaseProcHandle::sDummyBaseProcHandle;
+}
+
+}  // namespace ksys::act
\ No newline at end of file
diff --git a/src/KingSystem/ActorSystem/actBaseProcUnit.h b/src/KingSystem/ActorSystem/actBaseProcUnit.h
index 7bfe7e28..81d8ec4b 100644
--- a/src/KingSystem/ActorSystem/actBaseProcUnit.h
+++ b/src/KingSystem/ActorSystem/actBaseProcUnit.h
@@ -2,7 +2,8 @@
 
 #include <basis/seadTypes.h>
 #include <thread/seadCriticalSection.h>
-
+#include "KingSystem/ActorSystem/actBaseProcHandle.h"
+#include <thread/seadAtomic.h>
 namespace ksys::act {
 
 class BaseProc;
@@ -18,7 +19,7 @@ public:
 
 private:
     u32 mFlags;
-    BaseProcHandle* mHandle;
+    sead::Atomic<BaseProcHandle*> mHandle;
     BaseProc* mProc;
     // FIXME:
     // BaseProcRequest mRequest;