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I don't think this is the ex, Choi Jeong-Hyuk's doing. He'd have no reason to admit he had another sibling. I don't think it's the doctor either, Choi Eun-Yeong. Maybe his other brother? The blond teacher Jae-In confronted who mated with Teayoon's omega teacher. He might feel bad that he sacrificed Taeyoon knowing he was a victim as much as the omega. And if he found out that Jeong-Hyuk's people almost killed him? He might be feeling hella guilty. Stepping up as brother and uncle. Wait.... That would make Jae-Yoon all of the Choi's nephew. Idk how I feel about that....
He should have stayed in a coma....