Final answer:
In the story 'Soaring,' the individuals who had a bad feeling about Hong Xi's son Gil-Dong were his own stepmother and her fellow concubine. Jealous of the attention Hong Pansa, their lord, bestowed upon Gil-Dong, they feared for their position and plotted against him, seeking the aid of sorceresses.
Step-by-step explanation:
The individual who had a bad feeling about Hong Xi's soon-to-be wife in the story Soaring was Hong Pansa's wife and her fellow concubine, who is a dancing girl. They resented Hong Pansa's son, Gil-Dong, due to the father's evident admiration for him.
Jealous of the attention that Gil-Dong received from Hong Pansa, they began to plot against him, fearing that his continued presence would lead to their unhappiness.
Their plan involved consulting sorceresses or mootang to find a way to be rid of Gil-Dong, who was born to a rival woman in Hong Pansa's affections.
They believed that their peace could only be restored with the death of Gil-Dong, and they even influenced Hong Pansa to the extent that he considered assassinating his own son.