Betraying your organization

The whumpee could be part of some sort of "bad" organization (or not) and changes sides, maybe after finding out the group's true colors/motivations. Or because someone reached out to them and convinced them to finally make a stand. Or even, picture this: the whumpee is seen as a traitor, but nobody knows their exact reasons and they refuses to explain anything.

Does not apply to cases of "undercover", and might or might not be related to "you broke my heart".

And of course, spoiler alert.

Check the complete Tropes index for more.

Animes
Akatsuki no Yona


 * Soo-won betraying the king and his childhood friends is what sets the whole story into motion, but it's one of those cases where it's hard to point his exact motivation at first. He and Hak has a moment of fight and his shoulder is injured with a blade cut, but without consequences.

TV Shows
50M2 (or 50M²)


 * 1x01: Gölge (Engin Öztürk), hitman raised since young age by the criminal organization's boss, finds out the man has been lying to him, and hands over evidence against him to a jornalist.

Cursed


 * 1x10: (SPOILER) The Weeping Monk (Daniel Sharman) is an antagonist since the beginning, as one of the witch hunters, one of the most relentless among them... until he decides to save a little boy from torture and death. His former allies then surround him, and outnumbered, he gets beaten, falls on his knees and almost surrender to exhaustion.

Hanna


 * 1x01: Erik Heller (Joel Kinnaman) runs away with a woman and her baby, pursued by armed men and shot by an helicpoter. The car is hit and crashes against a tree. Continues to run on foot.

Kyle XY


 * 2x10: To let Kyle and Declan escape from the building, Tom Foss (Nicholas Lea) buys them time and ends up captured by the company he once betrayed.

Dramas
Word of Honor


 * Ep 1: It's shown that Zhou Zi Shu (Zhang Zhe Han) has been applying on himself the torture / prolonged sentence used on members who wish to leave the assassins organization, consisting in 7 nails implanted into his body. And leave is exactly what he does.