In the past they were both carried by Serin to the Baanan Clan Village where she left them during her escape attempt from Nex's army. Somehow the two struck up a friendship, despite Siana's status as the "witch's daughter" among other villagers. Siana ignorantly leads the Baanan Clan to its downfall by allowing Caladborg to spread his corruption through the villagers which prompts a visiting Nex to sentence an execution. While fleeing from Nex's army Xix is struck down causing an injured Siana to tap into her necromancy abilities to resurrect him via memories of Serin's resurrection of Jae-Hyuk resurfacing through her shared bloodline with Serin. Xix is healed but unable to control his newfound undead powers and fatally wounds Siana he believes. Unknown to Xix, who suffers from amnesia from the shock, Siana's undead abilities save her from death but she is whisked away by Caladborg leaving Xix with the belief she was killed by Nex. When the two are finally reunited several years later Siana is less than thrilled to reunite with him after their troubling departure. She demands to know why he struck her down baffling a still amnesic Xix. When he finally remembers the cause of her death he is grieved. While their past relationship has grown shaky Xix still holds Siana in high regard and considers her his most cherished person. Even Siana, despite her confusion on whether Xix is guilty in causing her death, still holds lingering affections towards the young man and is seen as distraught whenever he is injured or someone he cares for is harmed.
Yuan and Ninoorut are troubled by the lingering ties between the former friends since there are still yet unexplored affections the two hold for each other. Whether these feelings are romantic or familiar have yet to be addressed.