CEO, That Intern is Actually Your Wife (English-dubbed)

My billionaire CEO is my contract-married husband! My grandmother fell seriously ill, so I flash-married a stranger for her surgery fees. We entered a one-year contract marriage. I bumped into a handsome man, who I later found out was the CEO of the company I wanted to join! But little did I know, he was the man I married... As the contract period nears its end, we are supposed to divorce. However, both of us lost our marriage certificates. Now what do we do? Does this mean we can't get divorce