bié / yǐ / wéi / tā / zhǐ / shì / zài / kāi / wán / xiào / tā / zhè / huí / zhēn / de / yào / dòng / zhēn / gé

别以为他只是在开玩笑，他这回真的要动真格。

Don't think he is only joking; he really means business this time.