I was rewatching parts of ROCH 2006, parts when XLN related how OYF attacked the Ancient Tomb and fatally injured XLN's teacher. Later at Iron Spear Temple post-16 years with the Jin flunkies and Ke Zhen'er, YG hears about YK's plot with OYF to kill 5 of the Jiangnan Freaks and frame HYS. And of OYF's role in YK's death.
Throughout the Peach Blossom childhood and much of YG's pre-16 life, GJ and HR took care to withhold the truth about YK from YG, but they never held back on telling young YG about OYF's evil deeds.
Why did YG continue to love OYF so much? Jumping in joy and embracing OYF when he meets the old bastard again after he and XLN exit from Ancient Tomb 1st time round? Then later paying his respects at OYF's resting place at the end of ROCH...