The flag in the game decided or triggered the development of the plot, which was later widely extended to ACG's works, referring to the cause of specific events; Later, it was further extended to a sign or sign before a specific event occurred.
According to the characteristics that flag determines the development of the plot in word adventure games or animations, it is generally called XX flag as something that must/is likely to happen next.
The meaning of "flag" is similar to that of "foreshadowing", but "flag" emphasizes dramatic logic (the so-called "routine") rather than realistic logic. One-stop study abroad strategy in ing.com