If I remember correctly, it was the time when Chase got kidnapped by a bunch of Omegas and Betas. Among all the bodyguards that saved Chase, Josh was the most angered one. Well- after they did took down the kidnappers, and Josh helped Chase up, one of the beaten kidnappers got up and used a weapon (probably a gun) and injured Josh's ear where the plaster and mark is.. that's how everyone finds out about Josh's secondary gender (except Seth already knowing it) and Chase was shaken up by that. (In a good way, btw lol) (๑•ㅂ•)و✧
Seeing that mark is not the same as recognizing who put the mark there, at least in Chase's case.:D............................................
Spoiler.....
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He is convinced that the alpha woman who is Pete's father put it there. He considers becoming the stepdad of his own child ( like Keith Pittman in KLM).^^

Anyone got spoilers? Does he tell him hes an omega soon or after a good while?