Fiona and her sister Lacy’s family is destroyed after being framed for poisoning the imperial heir. Three years later, they enter the palace to uncover the truth: their parents were innocent scapegoats, and the real culprit is the emperor himself. Facing deadly secrets and royal conspiracies, the sisters fight to survive, overthrow a tyrant, protect the next emperor, and finally reclaim justice.
On Lana's Age Rite day, her family uses the palace reward to buy her the beloved Jade Lotus Pin. Their joy quickly fades when royal guards storm in, accusing the Fang family of harming the royal heir. Parents rush to hide the twin sisters, urging them to stay safe, while a guard’s comment hints at suspicious motives behind the sudden raid.
Opening with guards taking a dead man’s silver and planning to drink at the tavern, the episode shifts to twin sisters Lana and Lacy grieving their parents, who were wrongfully executed after Consort Gwen faked a miscarriage using their mother’s sour plum tea. Lady Yara exposes Gwen’s scheme to gain royal favor, and the sisters resolve to enter the palace to exact justice.
Twin sisters Lana and Lacy make a heart-wrenching choice—Lana gives up her freedom to become Lacy’s maid, hiding her from palace spies, and they seal a blood pact to avenge their mother by defeating Consort Gwen. When Gwen sends a crimson gown, a royal taboo, to sabotage Lacy at the royal draft, Lana uncovers the trap and plots to turn the malicious gift against its sender.
Lady Jane snatches a merchant's daughter's crimson gown to sabotage her at the Royal Draft. The girl is harshly punished by the king for wearing red, while Lacey from House of Chen impresses the king and is named Concubine Lacey. Furious, Jane swears to make Lacey's palace life unbearable.
Consort Gwen bullies newcomer Concubine Lacey by cutting coal and forcing her to kneel in snow. When Lacey's maid begs for mercy, Gwen orders her slapped. The King arrives just in time, and Lacey's clever words lead to Gwen being grounded. Lacey then swears revenge for her parents, sparking thrilling palace drama.
Concubine Lacey pretends to be sweet to win the King's favor and relax palace spies' vigilance. Consort Gwen hatches a devious plan to frame her using the mad Concubine Wanda from the Cold Palace, while Healer Luke recognizes Lacey's maid as a girl who aided him years ago, sparking hidden court tensions.
Lana discovers Royal Guard commander Lowe is the homeless boy she saved years ago, who sends osmanthus cakes as gratitude. Her lady swears revenge for Roman's death, suspects Gwen's plot, and they vow to unite against enemies.
In the eerily quiet plum garden rife with hidden danger, Lacy and her maid face a violent attack from a woman driven mad by her son's death. Blaming Lacy, she swears to kill her and be buried with her child; the maid courageously defends Lacy, sparking a desperate life-or-death showdown.
Wanda, two months pregnant, suffers a miscarriage after falling into water. A maid accuses Lana, Lacy's sister, of pushing her, sparking a heated dispute. As Lacy defends Lana, the one who saved Wanda is thanked, and His Majesty arrives, escalating the tense situation.
A maid falsely accuses Lacey and her servant of murdering the emperor’s unborn child by pushing Wanda into the lake. Lacey exposes the witness’s lie, but when she questions the legitimacy of Wanda’s pregnancy, she sparks the emperor’s fury, resulting in a brutal order of immediate executions for everyone involved.
In the royal court, a subject pleads with the king, while maid Luke exposes Wanda’s miscarriage is poison backlash from forced fake pregnancy drugs. After a heated dispute, the king orders a re-diagnosis, yet the hidden schemer has kidnapped Luke’s wife, threatening to force him to take full blame for the conspiracy.
The royal healer reveals Concubine Wanda's 'pregnancy' was fake due to forced drugs, then kills himself. A maid confesses framing Concubine Lacey, prompting the emperor to promote Lacey and punish Consort Gwen, who plots revenge using other concubines.
Lord Lowe reveals he knows the twin sisters' revenge mission against Consort Gwen and vows to secretly safeguard them. Consort Gwen, enraged by lost royal favor, torments one of the sisters' servants, while the twins set a clever trap to lure their enemy in.
Lacey schemes against the arrogant Concubine Wen. When the emperor notices Lacey’s haggard appearance and discovers her maid is cruelly punished by Wen, he intervenes. Wen’s defiant outburst results in her demotion to Lady and confinement, fueling the intense palace power struggle.
In this episode, conspirators scheme to eliminate Consort Gwen's allies, targeting Nanny Kong next. They recruit Evan to spy on Gwen's suspicious purchases, praise Concubine Lacey's maid for her clever self-injury trick that ruined Lady Wen, and Lord Lowe offers help to Lana, sparking intense harem power struggles.
The King dotes on concubine Lacey, neglecting Consort Gwen who manages the palace. Gwen decides to discipline Lacey at morning greetings, but Lacey wears padded kneepads, plotting to fake injury and turn the King against Gwen to seize her power.
The emperor accuses Consort Gwen of cruelty and strips her of the Phoenix Seal after a rival frames her. Gwen vows revenge with a disfiguring poison, unaware her opponent has uncovered her scheme and is ready to turn the tables as Dowager Mara and Empress Cora return soon.
Determined to avenge her parents’ unjust suffering, a brave character agrees to endure temporary facial sores caused by a fake poison, plotting to take down the scheming Consort Gwen once and for all. At Dowager Mara’s grand welcome banquet, Concubine Lacey’s unexpected absence sparks widespread fury; Consort Gwen maliciously insinuates Lacey has a shameful disease, drawing sharp rebuke and setting the stage for the upcoming revenge scheme.
Concubine Lacey suddenly breaks out in red sores and claims she's framed. The Emperor orders a thorough investigation. Guards catch Consort Gwen’s wet nurse red-handed; when Gwen tries to intervene, she’s told to explain to the Emperor and royals about the strange poison.
In this intense palace intrigue, ruthless Royal Guard Lana confronts Nanny Kong, who helped Consort Gwen destroy her family five years ago. She manipulates the nanny into believing Gwen wants her dead, compelling her to suicide to frame Gwen, unfolding a brutal psychological revenge showdown.