Cheon Do-Yun
As his mother, Yeong-Suk is protective of Do-Yun. She kept him in the dark about her history. He did not know of the massacre of her childhood, her deal with the fox spirit or with Malegami, or her history as a genuine shikarist. She raised him to fear the Spirit Realm and hid his kitsune heritage. Her obfuscation is born of fear and love, believing him to be safest not knowing and avoiding the Spirit Realm. She scolds him when he disobeys her lessons, but always assures him of her love. She is shown to be willing to go to great lengths for Do-Yun's safety even before he was born: the deal with Malegami had been conducted to protect him, and she had been willing to sentence another person to an eternity of suffering to do so.
Takeda Kichiro
Descriptions from Nam Eun-Ae picture Yeong-Suk and Kichiro as young lovers. Kichiro himself has implied a more fraught history, stating that they met when Yeong-Suk had been intending to kill him. However, they did end up in a committed relationship and intending to raise a child together. The results of Malegami's deal, however, appears to have broken their relationship. Yeong-Suk is now hostile towards Kichiro, trying to keep him away from Do-Yun.
Nam Eun-Ae
Yeong-Suk and Eun-Ae were disciples of the same sect. Though she greatly disapproved of Yeong-Suk's relationship with Kichiro, Eun-Ae still covered for her and kept her secret from their sect. The two of them were close friends in their youth, though lost contact after Yeong-Suk's departure from the sect.