diff --git a/apps/showcase/src/components/voice.js b/apps/showcase/src/components/voice.js
index 62b1e2f..c68d585 100644
--- a/apps/showcase/src/components/voice.js
+++ b/apps/showcase/src/components/voice.js
@@ -95,7 +95,7 @@ export default class Voice {
         this.#default.language.voice = this.#voice.languages[0]
         this.#config.language = this.#default.language.voice
         this.#voice.locations = this.#getVoiceLocations()
-        this.#voice.list = Object.keys(this.#getVoices())
+        this.#voice.list = this.#charwordTable.availability[this.#config.language]
     }
 
     success() {
@@ -206,7 +206,7 @@ export default class Voice {
         const content = subtitle.text
         const cvInfo =
             this.#charwordTable.voiceLangs[this.subtitleLanguage][
-                this.#config.language
+            this.#config.language
             ]
         document.getElementById('voice-title').innerText = title
         document.getElementById('voice-subtitle').innerText = content
@@ -251,15 +251,7 @@ export default class Voice {
 
     #nextVoice() {
         const getVoiceId = () => {
-            let list = this.#voice.list
-            if (
-                this.#config.language === 'EN' ||
-                this.#config.language === 'KR'
-            ) {
-                // filter out CN_043 as this voice is not available in en and kr
-                list = list.filter((item) => item !== 'CN_043')
-            }
-            const id = list[Math.floor(Math.random() * list.length)]
+            const id = this.#voice.list[Math.floor(Math.random() * this.#voice.list.length)]
             return id === this.#voice.id.last ? getVoiceId() : id
         }
         this.#playVoice(getVoiceId())
@@ -360,8 +352,10 @@ export default class Voice {
     set language(lang) {
         if (this.#voice.languages.includes(lang)) {
             this.#config.language = lang
+            this.#voice.list = this.#charwordTable.availability[lang]
         } else {
             this.#config.language = this.#default.language.voice
+            this.#voice.list = this.#charwordTable.availability[this.#config.language]
         }
         const availableSubtitleLang = this.#getSubtitleLanguages()
         if (!availableSubtitleLang.includes(this.#config.subtitle.language)) {
diff --git a/packages/charword-table/index.ts b/packages/charword-table/index.ts
index 694d92c..566f0da 100644
--- a/packages/charword-table/index.ts
+++ b/packages/charword-table/index.ts
@@ -89,6 +89,7 @@ export const build = async (namesToBuild: string[]) => {
         const voiceJson = {} as OperatorCharwordTable
         voiceJson.voiceLangs = {}
         voiceJson.subtitleLangs = {}
+        voiceJson.availability = {}
         const subtitleInfo = Object.keys(charwordTableLookup.info) as Region[]
         const voiceList = {} as {
             [key: string]: string[]
@@ -119,65 +120,69 @@ export const build = async (namesToBuild: string[]) => {
                 )
             }
         })
-        let voiceLangs = [] as string[]
         try {
-            voiceLangs = getLangs(name, voiceJson).voiceLangs
+            const voiceLangs = getLangs(name, voiceJson).voiceLangs
+
+            // check whether voice files has been added
+            const customVoiceName = voiceLangs.filter(
+                (i) => !config.dir_name.voice.sub.map((e) => e.lang).includes(i)
+            )[0]
+            const voiceLangMapping = config.dir_name.voice.sub
+                .filter((e) => {
+                    return (
+                        voiceLangs.includes(e.lang) ||
+                        (e.lang === 'CUSTOM' &&
+                            typeof customVoiceName !== 'undefined')
+                    )
+                })
+                .map((e) => {
+                    return {
+                        name: e.name,
+                        lang: e.lang === 'CUSTOM' ? customVoiceName : e.lang,
+                        lookup_region: e.lookup_region.replace('_', '-'),
+                    }
+                })
+            for (const voiceSubFolderMapping of voiceLangMapping) {
+                const voiceSubFolder = path.join(
+                    OPERATOR_SOURCE_FOLDER,
+                    name,
+                    config.dir_name.voice.main,
+                    voiceSubFolderMapping.name
+                )
+                const voiceFileList = file.readdirSync(voiceSubFolder)
+                voiceJson.availability[voiceSubFolderMapping.lang] =
+                    voiceFileList.map((item) => item.replace('.ogg', ''))
+                voiceJson.availability[voiceSubFolderMapping.lang].sort()
+                voiceList[voiceSubFolderMapping.lookup_region].forEach(
+                    (item) => {
+                        // an exception for detecting file existence
+                        if (
+                            item.endsWith('043') &&
+                            voiceFileList.includes(`${item}.ogg`) &&
+                            (voiceSubFolderMapping.name === 'kr' ||
+                                voiceSubFolderMapping.name === 'en')
+                        ) {
+                            console.log(
+                                `Voice folder ${voiceSubFolderMapping.name} for ${name} has ${item}.ogg`
+                            )
+                        }
+                        if (
+                            !voiceFileList.includes(`${item}.ogg`) &&
+                            // make an exception
+                            !item.endsWith('043')
+                        ) {
+                            err.push(
+                                `Voice folder ${voiceSubFolderMapping.name} for ${name} is missing ${item}.ogg`
+                            )
+                        }
+                    }
+                )
+            }
 
             file.writeSync(JSON.stringify(voiceJson), getDistDir(name))
         } catch (e) {
             console.log(`charword_table is not available`, e)
         }
-
-        // check whether voice files has been added
-        const customVoiceName = voiceLangs.filter(
-            (i) => !config.dir_name.voice.sub.map((e) => e.lang).includes(i)
-        )[0]
-        const voiceLangMapping = config.dir_name.voice.sub
-            .filter((e) => {
-                return (
-                    voiceLangs.includes(e.lang) ||
-                    (e.lang === 'CUSTOM' &&
-                        typeof customVoiceName !== 'undefined')
-                )
-            })
-            .map((e) => {
-                return {
-                    name: e.name,
-                    lang: e.lang === 'CUSTOM' ? customVoiceName : e.lang,
-                    lookup_region: e.lookup_region.replace('_', '-'),
-                }
-            })
-        for (const voiceSubFolderMapping of voiceLangMapping) {
-            const voiceSubFolder = path.join(
-                OPERATOR_SOURCE_FOLDER,
-                name,
-                config.dir_name.voice.main,
-                voiceSubFolderMapping.name
-            )
-            const voiceFileList = file.readdirSync(voiceSubFolder)
-            voiceList[voiceSubFolderMapping.lookup_region].map((item) => {
-                // an exception for detecting file existence
-                if (
-                    item.endsWith('043') &&
-                    voiceFileList.includes(`${item}.ogg`) &&
-                    (voiceSubFolderMapping.name === 'kr' ||
-                        voiceSubFolderMapping.name === 'en')
-                ) {
-                    console.log(
-                        `Voice folder ${voiceSubFolderMapping.name} for ${name} has ${item}.ogg`
-                    )
-                }
-                if (
-                    !voiceFileList.includes(`${item}.ogg`) &&
-                    // make an exception
-                    !item.endsWith('043')
-                ) {
-                    err.push(
-                        `Voice folder ${voiceSubFolderMapping.name} for ${name} is missing ${item}.ogg`
-                    )
-                }
-            })
-        }
     }
 
     return err
diff --git a/packages/charword-table/types.ts b/packages/charword-table/types.ts
index 528b6e1..20a6571 100644
--- a/packages/charword-table/types.ts
+++ b/packages/charword-table/types.ts
@@ -90,6 +90,9 @@ export type CharwordTableJson = {
 }
 
 export type OperatorCharwordTable = {
+    availability: {
+        [languageCode: string]: string[]
+    }
     voiceLangs: {
         [languageCode: string]: {
             [voiceLangType: string]: string[]