La(4th) 5,000 Won Note
① Windowed Security Thread
A plastic film with hologram letters is exposed at regularly spaced intervals. When the banknote is held up to the light, the segments of the thread are connected as a bold continuous line.
Holding the note up to the light, a hidden portrait of Yulgok appears in the non-image space on the left side of the obverse(and the right side of the reverse).
③ Watermark Bar
Held up to the light, three horizontal dark bars and two bright bars appear in turn, thanks to the variation in thickness with in each note.
④ See-through Register
Held up to the light, the right-corner image on the observe matches the image on the reverse.
⑤ Intaglio Printing
A special method putting ink into the concave and printing as convex. The slightly raised figures can be felt.