The photograph was of Jaeha kissing his professor while in college. His "friend" in college took the picture and sent it around. Everyone found out he was in a relationship with a man. It eventually got to his father--who kicked him out and later to his wife and that is why they got a divorce. That photograph pretty much ruined Jaeha's love life and made him the person that he is today.
There is more to that as well. Jaeha's professor was very problematic and manipulative, the flashback episode the author did is very spotty in my memory but I remember that he was a dick and fucked up Jaeha a good part.
Thank you very much!! (づ￣ ³￣)づ
Ah, makes more sense :)
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Every characters kind of making a big deal about the mysterious photo.... What exactly was it and why was it such a big deal?? Thank you!~