This is episode 60 of 87 of The CEO's Wife Wants a Divorce. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
Orphan Gu Zhenzhen is knocked out while saving a CEO's wife and wakes up in her place—with a wealthy husband Fu Jinnian and his son. When she insists she's not his wife, he shows their marriage certificate and demands that she repay 300 million if she wants to leave.