This kind of person didn't succeed in reaching the Golden Core stage back then? Feng Jun was a bit puzzled in his heart, and then he understood: attempted the Golden Core stage once (failed).
Theoretically, one can try to reach the Golden Core stage three times, but the second attempt is ten times harder than the first, and the resources required also increase tenfold, so basically, no one attempts the second Golden Core stage.
One can imagine, a success rate of seventy percent at the Out of Body peak, fails once, and the success rate the second time becomes just 0.7 percent. If seventy percent isn't successful, who would gamble on that seven percent?
Not to mention that it requires ten times the resources.
As for succeeding on the third attempt? That's only a theoretical possibility; no one has ever tried.