After Reset This Phone Still Want My Google Account Lenovo Phone A7000

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hye,I bought this phone from someone. he asked me to do a hard reset on the phone. after I do a hard reset, the phone said’‘sign in with a Google account that was previously synced on this device." I don’t know the person’s Google account. so how am I supposed to do?

How to resetting Lenovo a7000.asking to Google account repeat.