"...So you're not my father's friend.... I already had a feeling. If my father had a friend, he would've at least mentioned it to me. All his life, he was only ever busy with work... Yeah, most of the time, when he was still alive, was spent working....—"
Yeah, if Suga thought back to his childhood, the majority of his father's life had been spent working. There were moments when he stayed home a little longer, spending time with him and his mother, but even then, his job, which Suga had only come to understand later was tied to his work as a spy, continued, and he would often leave again. That man, his father— must have wanted to spend more time with his family, but the nature of his work had never allowed him the space to do so.