First Generation Robin, Xi Nian’s Identity?

Many people in the outside world knew. After Batman returned to Gotham City five years ago, he began training successors to fight crime, and those successors came to be known as—"Robin"! Robin did not refer to one person, but represented an identity, even the Batman Family itself. Over the past five years, four Robins had appeared: Second Generation Robin Dick Grayson, Third Generation Robin Jason Todd, Fourth Generation Robin Tim Drake, and Fifth Generation Robin Damian Wayne, the son of the Wayne Family. Half a year ago.