diff --git "a/point/noun_\354\225\274.yaml" "b/point/noun_\354\225\274.yaml"
deleted file mode 100644
index 349b3b3..0000000
--- "a/point/noun_\354\225\274.yaml"
+++ /dev/null
@@ -1,18 +0,0 @@
-name: (이)야
-definitions:
-  - slug: emphasis
-    name: Emphasis
-    english_alternatives:
-    meaning: Particle referring to an emphasis.
-    examples:
-      - sentence: <f>커피야</f> 늘 한 잔씩 마시고 있어.
-        type: simple
-        translated: I always have a cup of coffee.
-        audio_url:
-      - sentence: 왜 <f>이제야</f> 도착하는 거야?
-        type: simple
-        translated: Why are you just getting here now?
-        audio_url:
-metadata:
-  type: noun
-details: |-
diff --git "a/point/noun_\354\235\264\353\213\244.yaml" "b/point/noun_\354\235\264\353\213\244.yaml"
index 81d9040..3cffa82 100644
--- "a/point/noun_\354\235\264\353\213\244.yaml"
+++ "b/point/noun_\354\235\264\353\213\244.yaml"
@@ -13,10 +13,6 @@ definitions:
         type: simple
         translated: Today is my friend's birthday.
         audio_url: https://r2.kimchi-reader.app/grammar/오늘은_내_친구_생일이에요__2024-03-31.mp3
-      - sentence: 지금은 쉬는 시간<f>이야</f>.
-        type: simple
-        translated: Now is break time.
-        audio_url: https://r2.kimchi-reader.app/grammar/지금은_쉬는_시간이야__2024-03-31.mp3
 metadata:
   type: noun
 details: |-
@@ -25,7 +21,7 @@ details: |-
   - <f>입니다</f>: Formal, polite form, used in formal writings or respectful speech.
   - <f>예요</f>/<f>이에요</f>: Polite form, used in everyday polite conversation. <f>예요</f> follows
     a vowel, and <f>이에요</f> follows a consonant.
-  - <f>이야</f>: Informal form, used with close friends or in casual settings.
+  - <f>이야</f>: Informal form, used with close friends or in casual settings - See :grammar[noun_이야].
 
   # Opposite {#opposite}
   The opposite of :dict[이다] is :dict[아니다].
diff --git "a/point/noun_\354\235\264\354\225\274.yaml" "b/point/noun_\354\235\264\354\225\274.yaml"
new file mode 100644
index 0000000..1e95f2f
--- /dev/null
+++ "b/point/noun_\354\235\264\354\225\274.yaml"
@@ -0,0 +1,27 @@
+name: (이)야
+definitions:
+  - slug: copula
+    name: Copula
+    english_alternatives: to be, is
+    meaning: Express that the subject and predicate are the same thing.
+    examples:
+    - sentence: 지금은 쉬는 시간<f>이야</f>.
+      type: simple
+      translated: Now is break time.
+      audio_url: https://r2.kimchi-reader.app/grammar/지금은_쉬는_시간이야__2024-03-31.mp3
+  - slug: emphasis
+    name: Emphasis
+    english_alternatives:
+    meaning: Particle referring to an emphasis.
+    examples:
+      - sentence: <f>커피야</f> 늘 한 잔씩 마시고 있어.
+        type: simple
+        translated: I always have a cup of coffee.
+        audio_url: https://r2.kimchi-reader.app/grammar/커피야_늘_한_잔씩_마시고_있어__2024-05-28.mp3
+      - sentence: 왜 <f>이제야</f> 도착하는 거야?
+        type: simple
+        translated: Why are you just getting here now?
+        audio_url: https://r2.kimchi-reader.app/grammar/왜_이제야_도착하는_거야__2024-05-28.mp3
+metadata:
+  type: noun
+details: |-
diff --git a/relation.yaml b/relation.yaml
index e93f133..84b8fab 100644
--- a/relation.yaml
+++ b/relation.yaml
@@ -38,3 +38,6 @@ relation:
       - { id: "verb_아서_어서_해서", slug: "reason-or-cause" }
       - { id: "때문에", slug: "reason-or-cause" }
       - { id: "verb_으니까_니까", slug: "reason-or-cause" }
+  - concern:
+      - { id: "noun_이야", slug: "copula" }
+      - { id: "noun_이다", slug: "copula" }