reincarnated as the 8th wife of a tyrant king

mica, a pharmaceutical scientist who developed new drugs and discovered pharmaceutical plant compounds, found herself reincarnated into her teenage favorite fantasy novel, in which the tyrant king falls in love with the queen lady in waiting (lyca), This sparks rivalry and jealousy throughout the kingdom, which leads to the queen being beheaded by the king in order to marry his love of his life. well......... mica reincarnated into that queen

Now she will need to devise a plan to escape her fate and find a loophole in this story in order to go back into her reality. Can she get the favor of the king? Not only that but she need to get the favor of the king's children from his previous marriage, will she gain the love and respect that she needs?