Jin hardly went off on her own, almost always staying with Mitsunari on excursions, but anytime she got even an inkling that the lead she got might relate to her missing child in some way, she did whatever should could to investigate it. She never spoke about it openly, and even if it was brought up, she hardly spoke about it, but she never really gave up hope on her child being alive.
When she got that call just minutes before getting off of work, she couldn’t help it, couldn’t even try to stop herself from leaving the building and going in search of her son, praying every time that it would finally be him.