Fans have been buzzing about a certain cameo in the hit K-Drama "Twenty-Five Twenty-One". The drama stars Kim TaeRi (as Na HeeDo) and Nam JooHyuk (as Baek YiJin) and tells the story of two people who first met when they were 22 and 18. The story follows the pure and fierce growth of immature youth and the excitement and difficulties between friendship and love.

Recently, fencing athlete Kim JunHo made an appearance in the K-Drama as one of Na HeeDo's seniors in fencing.

SPOILER ALERT!!

When Na HeeDo wraps up one of her matches, Baek YiJin is sitting outside and overhears an exchange between Na HeeDo and Kim JunHo. Na HeeDo calls him, "JunHo Oppa," which makes Baek YiJin so jealous that he is literally grasping onto a pole.

Many may have thought that Kim JunHo was an actor, but he is actually a professional fencing athlete in Korea. He is a gold medalist and world champion born in 1994. You can follow Kim JunHo on Instagram @kjh_0526.

Here is a video where he shows off his ability to jab a grape on TV.

Many enjoyed his cameo especially because of the reaction it riled out of Baek YiJin.

Some other fans have even been speculating that Kim JunHo might be MinChae's father. Many have been wondering whether MinChae's father is Baek YiJin or someone else, since the beginning of the series, and one fan jokingly solved the mystery.

What did you think of his cameo? Let us know in the comments.