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How to force the English Language:
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Note: Need Root access.

Edit this file:
/data/data/com.netmarble.ennt/shared_prefs/NetmarbleNeo_ProjectN.xml

Search and replace:

<string name="Language">0</string>
to <string name="Language">2</string>

<string name="CONFIG_SAVED_LANGUAGE_CODE">zh-TW</string>
to <string name="CONFIG_SAVED_LANGUAGE_CODE">en</string>

<string name="CONFIG_SAVED_CULTURE_CODE">zh-TW</string>
to <string name="CONFIG_SAVED_CULTURE_CODE">en</string>

<string name="LanguageOptionSet">0</string>
to <string name="LanguageOptionSet">2</string>