The Dark Between New Moon and Full Moon [Whistle Blows]

Partially uses Sentinel-Guide setting. Interstellar future. Father and son, twins. One is cold and gloomy, the other sunny and gentle. Yet the son carries his father's blood, and the father catches a glimpse of the truth. Everything remains shrouded in mystery. A story about twin sons who are both reborn and set out to win over their father. One-on-one romance.