After lightning ignites a fire, Yi In sees it as a sign from above. As Queen Oh's health falters, Hee-soo strives to protect the Grand Prince's fate.

A last-minute change of heart gravely injures Hee-soo — prompting questions around her gender. Later, Yi In reveals the fate of her father to her.

In a vulnerable moment, Lee In shares the secret of his ascension with Hee Soo. Jong Hwan plans a counterattack for Lee In's investigation of past events.