Serena, heir to Avalon, marries Leon, believing he saved her life. She helps him become Crown Prince, only to discover at his coronation that he is having an affair with Lady Clarice. Serena quietly takes back everything she gave him. As she brings down the traitor, she finds her true savior--Gabriel, Avalon's legendary Captain.
Three years after giving up Avalon's throne for Leon Sterling, the royal heir is tracked down by Royal Guard commander Gabriel and pressured to return. As Leon's crown prince investiture looms, old tensions resurface, with questions swirling about Leon's merchant wife Serena.
Serena catches Leon with Clarice, who flaunts her family's military power and claims she's pregnant. Leon sides with Clarice, promising her equal status, but Serena shocks everyone by announcing she'll annul their marriage tomorrow.
Serena confronts Leon for ditching their wedding vows to chase the throne with Clarice's military backing. When she refuses to help his alliance with Royal Guard Captain Gabriel, Leon locks her up, pushing Serena to demand a marriage annulment in this fiery clash of love and ambition.
Curiosity grows over Serena's unknown background and combat skills. She stuns everyone by announcing her divorce from Leon, brushes off rivals' disdain, and issues a fierce order to cut supplies to the Northern Legion supporting her opponents, showcasing her hidden authority and grit.
A tense opening dialogue questions whether someone deserves the favors they’ve been given. Moments later, a cry for help echoes—someone is trapped with everyone busy at a bonfire dance. A rescuer arrives to comfort the victim, and Serena hints at her link to the northern convent, teasing hidden secrets.
The prince declares he’ll never lose Serena, Leon’s wife, again. He approves cutting Leon’s northern trade routes and convincing allies to withdraw support. Refusing to leave Leon’s gifted estate, he waits for Leon to beg to end their marriage. He also reveals he chose Leon believing he saved him years ago—now seeing it as a cruel joke—just as Lady Sterling arrives.
When Serena's mother-in-law and sister-in-law mock her for wanting to divorce Prince Leon, she strikes back, revealing she’s the source of Leon’s wealth, crown prince status and noble support. She demands half his assets and a three-day divorce, then contacts the Avalon ambassador to announce her royal return.
Princess Serena, Avalon’s true heir, is finally coming home, sparking urgent preparations. Devereux faces a dire crisis as northern trade routes are blocked by a mysterious golden lion crest army, cutting off grain to its Northern Legion. Leon Sterling gains Avalon’s Captain’s support, but their alliance depends entirely on Serena’s approval.
Lord Leon and his allies mock Serena, dismissing her as a lowborn merchant for seeking divorce. The Captain shocks everyone by ending Avalon's alliance with the Northern Legion, hinting Serena holds far greater significance than they realize.
At the grand Midfire Feast, Crown Prince Gabriel tries delaying his divorce from Serena to secure his new status. Clarice colludes with Lord Leon secretly. When Gabriel toasts their third anniversary publicly, Serena confronts him, demanding he sign the divorce papers immediately.
At a royal banquet, Lady Serena is accused of being with a guard in bed. Prince Leon defends his wife, but nobles demand her arrest and marriage annulment. Serena's maid challenges the claim by insisting on opening the door, just as Serena speaks up, igniting dramatic tension.
Ivy confronts Serena, accusing her of ruining her reputation. Serena retorts that she turned the drugged wine trap back on those plotting against her. Amid the heated clash, an arrest order is issued, sparking a dramatic twist-filled showdown that draws viewers in.
After a tense standoff with Leon and Gabriel over her departure, Serena wakes from a vivid dream, suspecting Leon isn't the boy who saved her due to a missing arm mark. She learns Gabriel was also in the old knight camp and defies orders to confront him at the hot spring.
The King summons his court to address the Northern Legion's grain shortage amid Avalon's suspicious border troop movements. He orders Leon to resolve the crisis within three days. The Crown Princess then arrives, refusing to kneel and sparking a tense confrontation with the monarch.
In Starfall's royal palace, Serena confronts the king to annul her marriage to Crown Prince Leon, defying royal etiquette. Mocked by courtiers, she shocks everyone by vowing to solve the kingdom's grain crisis in two days—on the condition that Leon and Lady Sterling kneel to beg her for divorce.
Serena boldly demands the Crown Prince and Queen kneel for grain as Avalon's army nears the border. The prince rejects her ultimatum, vowing to solve the grain shortage in three days despite advisors' warnings, and refuses to beg Serena who holds ties with northern lords.
Lord Leon pushes his way to meet Serena, attempting to justify his betrayal with hollow promises. Serena sees through his lies, exposes his real motive of solving the grain problem, and summons guards to report him for assault, serving up a fierce rejection.
Tensions ignite when Gabriel warns Leon to stay away from Lady Serena, and someone gives her a signal flare for emergency help. Clarice proposes a grain-gathering plan to solve the crisis but secretly resents Serena’s influence. A rumor about Serena then spreads, stirring fresh intrigue.
Leon rages over malicious rumors sweeping Starfall, ordering their destruction and source tracing—yet a hidden power fuels them. His reputation suffers, leaving few great houses donating grain; even Clarice’s family refuses help. He awaits Serena’s background report and threatens her kin.
Short on grain and abandoned by nobles, Prince Leon orders a kingdom-wide investigation into Serena’s family ties. Serena learns of his scheme, realizing Gabriel is behind spreading Leon’s scandals, worsening Leon’s desperate predicament.