After the war ended.
Being slapped with reality Jin finally realized his increasingly out-of-control tendencies to do mass murders. When the war finally ended Jin was not able to satisfy his bloodlust for a long time, at that time he started to pay attention to the woman who made him aware of his insanity.
As time passed feelings developed slowly Jin finally started to have a calm personality, he spent most of his final days in the army observing Anna from his office window, seeing her train the other war mages was a sight to behold.
Of course, his strange personality never really went anywhere, though as he made Anna do the laundry of about five hundred mages all by herself, as a punishment for slapping her superior in the army.
The puffed-up cheeks of Anna, washing the laundry with her magic in the morning sunlight was nice scenery, for Jin teasing Anna was his second favorite thing, the first being massacre.
