diff --git a/proto/BuyResinReq.proto b/proto/BuyResinReq.proto
new file mode 100644
index 00000000..868c77e4
--- /dev/null
+++ b/proto/BuyResinReq.proto
@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: NIBFJEFHMIM
+// CmdId: 630
+message BuyResinReq {
+}
+
diff --git a/proto/BuyResinRsp.proto b/proto/BuyResinRsp.proto
new file mode 100644
index 00000000..6f13c89b
--- /dev/null
+++ b/proto/BuyResinRsp.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: PFLBPGOHFKJ
+// CmdId: 687
+message BuyResinRsp {
+    int32 retcode = 9;
+    uint32 cur_value = 3;
+}
+
diff --git a/proto/Investigation.proto b/proto/Investigation.proto
new file mode 100644
index 00000000..782244c3
--- /dev/null
+++ b/proto/Investigation.proto
@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: NFAGLBHALKL
+message Investigation {
+    // Name: DMECJPCEPNH
+    enum State {
+        INVALID = 0;
+        IN_PROGRESS = 1;
+        COMPLETE = 2;
+        REWARD_TAKEN = 3;
+    }
+
+    uint32 id = 2;
+    State state = 4;
+    uint32 total_progress = 5;
+    uint32 progress = 11;
+}
+
diff --git a/proto/InvestigationTarget.proto b/proto/InvestigationTarget.proto
new file mode 100644
index 00000000..9d3e2899
--- /dev/null
+++ b/proto/InvestigationTarget.proto
@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: EJKIKKJCFKL
+message InvestigationTarget {
+    // Name: PMPLOIOCICM
+    enum State {
+        INVALID = 0;
+        IN_PROGRESS = 1;
+        COMPLETE = 2;
+        REWARD_TAKEN = 3;
+    }
+
+    State state = 6;
+    uint32 total_progress = 5;
+    uint32 investigation_id = 7;
+    uint32 quest_id = 14;
+    uint32 progress = 1;
+}
+
diff --git a/proto/PlayerInvestigationAllInfoNotify.proto b/proto/PlayerInvestigationAllInfoNotify.proto
new file mode 100644
index 00000000..4139fd07
--- /dev/null
+++ b/proto/PlayerInvestigationAllInfoNotify.proto
@@ -0,0 +1,14 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+import "Investigation.proto";
+import "InvestigationTarget.proto";
+
+// Name: HCPEEIEKMCL
+// CmdId: 1911
+message PlayerInvestigationAllInfoNotify {
+    repeated Investigation investigation_list = 10;
+    repeated InvestigationTarget investigation_target_list = 12;
+}
+
diff --git a/proto/PlayerInvestigationNotify.proto b/proto/PlayerInvestigationNotify.proto
new file mode 100644
index 00000000..943ae92f
--- /dev/null
+++ b/proto/PlayerInvestigationNotify.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+import "Investigation.proto";
+
+// Name: KFLGDLECPAK
+// CmdId: 1901
+message PlayerInvestigationNotify {
+    repeated Investigation investigation_list = 6;
+}
+
diff --git a/proto/PlayerInvestigationTargetNotify.proto b/proto/PlayerInvestigationTargetNotify.proto
new file mode 100644
index 00000000..562ecbc3
--- /dev/null
+++ b/proto/PlayerInvestigationTargetNotify.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+import "InvestigationTarget.proto";
+
+// Name: MOGCBFKFHDN
+// CmdId: 1930
+message PlayerInvestigationTargetNotify {
+    repeated InvestigationTarget investigation_target_list = 1;
+}
+
diff --git a/proto/TakeInvestigationRewardReq.proto b/proto/TakeInvestigationRewardReq.proto
new file mode 100644
index 00000000..058ce057
--- /dev/null
+++ b/proto/TakeInvestigationRewardReq.proto
@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: ECINNKNDEAB
+// CmdId: 1928
+message TakeInvestigationRewardReq {
+    uint32 id = 14;
+}
+
diff --git a/proto/TakeInvestigationRewardRsp.proto b/proto/TakeInvestigationRewardRsp.proto
new file mode 100644
index 00000000..aef7df36
--- /dev/null
+++ b/proto/TakeInvestigationRewardRsp.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: MADHMGMOJPM
+// CmdId: 1910
+message TakeInvestigationRewardRsp {
+    uint32 id = 10;
+    int32 retcode = 6;
+}
+
diff --git a/proto/TakeInvestigationTargetRewardReq.proto b/proto/TakeInvestigationTargetRewardReq.proto
new file mode 100644
index 00000000..5d6d6dc0
--- /dev/null
+++ b/proto/TakeInvestigationTargetRewardReq.proto
@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: HEBFDFDMOFH
+// CmdId: 1926
+message TakeInvestigationTargetRewardReq {
+    uint32 quest_id = 15;
+}
+
diff --git a/proto/TakeInvestigationTargetRewardRsp.proto b/proto/TakeInvestigationTargetRewardRsp.proto
new file mode 100644
index 00000000..faa5250a
--- /dev/null
+++ b/proto/TakeInvestigationTargetRewardRsp.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+option java_package = "emu.grasscutter.net.proto";
+
+
+// Name: LHAPHELPIHC
+// CmdId: 1927
+message TakeInvestigationTargetRewardRsp {
+    int32 retcode = 6;
+    uint32 quest_id = 14;
+}
+