How to tell if a movie is real or not by looking at the prologue subtitles before it starts

This Yeong-ha became Geja based on Shin Hwa-ru.
High probability of fabrication
Names of people mentioned or depicted in this film, companies and organizations, and other three-dimensional names
And the events and episodes are all fictionally created.
Even if there is a difference from reality, it is clear that it is due to coincidence.
There is a high probability that it is a true story.