Trial Marriage: Caught by the Mysterious Man

The night before their wedding, her fiancé ran off with his mistress.
Out of frustration, she grabbed the man standing in front of the Civil Affairs Office, "President Chadwick, your bride has not arrived and my groom has run away...May I suggest we get married?"
Before marriage, she said, "Even if we were to share the same bed, nothing would happen between us!"
After marriage, he said, "If we don't try, how would we know?"