Prince James breaks off his engagement and violently rejects Yuna, leaving her near death and sparking her father's plea for justice to the Emperor. Yuna unexpectedly recovers and reveals she has transmigrated into a book's plot, where marrying James means doom for her family. To avoid this fate, she claims to love the powerful eunuch Lord Regent Nolan Channing, hoping to dodge a forced marriage and her deadly destiny. However, upon activation of a mysterious Heartbeat System, Yuna is bound to Nolan and faces a deadly countdown that forces her to kiss him or die instantly, leaving her fate uncertain.
After reluctantly completing a forced kiss mission to activate a mysterious system promising to extend her life, Yuna faces immediate danger from Lord Nolan, the ruthless Regent who refuses to spare her despite her life extension. Her father pleads for her safety, but Nolan insists on punishment for her insult. Defeated and desperate, Yuna collapses, prompting urgent medical aid. Meanwhile, an unknown voice reveals a deadly intent to eliminate Yuna's family. Yuna awakens with only one hour of life left, reliant on the glitchy system's kiss-based recharge to survive, setting a tense countdown for her next move.
The Chancellor's daughter, trapped in a deadly game, learns she has only one hour left to live after completing her activation mission. To survive, she must increase her bound partner Nolan's pleasure by kissing him, despite knowing he wants to kill her. Defying fear, she boldly enters the Regent Mansion at night and confronts Nolan with a kiss. Suspicious guards nearly attack her, but Nolan orders them to stand down, intrigued by her audacity. As she navigates threats and unravels sinister plots involving poison and political betrayal, her life hangs by a thread with only seconds remaining.
Yuna sneaks into Lord Nolan’s mansion at night, attempting to get close to him despite previous failures and his mistrust. When Nolan accuses her of poisoning and breaking in, Yuna confesses her true intent: she’s pursuing him, not Prince James as rumored. Despite Nolan’s reminder that he is a eunuch despised by women, Yuna insists she doesn't care, declaring herself his soulmate. Nolan, shocked and suspicious, orders Yuna sent away. As she leaves, Nolan struggles to believe her feelings are genuine, while Yuna vows to return and face the consequences of her bold approach.
Yuna faces intense pressure from her father and family to marry Nolan, an influential eunuch, believing this alliance will save them from ruin. However, Yuna fears Nolan's dark plans, including using her brother Jensen to harm the imperial consort's unborn child. Jensen remains trapped in the palace due to the consort's imminent childbirth, complicating Yuna's efforts. Meanwhile, Nolan resists marrying Yuna, causing conflict between them. Yuna discovers Nolan may be a reborn figure acting against expected palace politics. As Nolan stays behind the palace for a secret meeting, Yuna hastily prepares to confront him, with tensions escalating toward an uncertain outcome.
Yuna is tasked with sharing a carriage with Nolan despite her reluctance, sparking tension due to their complicated connection. Nolan confronts her about her lingering ties to Prince James, accusing her of playing hard to get and jealousy. Yuna shows Nolan a painful injury she claims is his doing, further complicating their uneasy relationship. Nolan remains cold but ensures she gets to the Chancellor Mansion safely, warning her to leave immediately upon arrival. After completing this risky mission, Yuna learns she must earn merit points by reforming villains to return home, revealing a daunting challenge ahead.
Yuna and Lord Nolan encounter a tense moment when Nolan is suspected of hiding a weapon, sparking suspicion and distrust between them. Despite Yuna's attempt to lighten the mood with a kiss, Nolan's feelings remain distant and guarded. Yuna then pleads for Nolan's help to rescue her brother Jensen, who is trapped in the palace and unable to leave due to imperial orders. Nolan coldly refuses, revealing he has no loyalty to her family and showing no intention of intervening. The episode ends with Yuna facing Nolan's harsh rejection and her brother's dire situation unresolved.
The episode opens with a woman carefully trying to avoid suspicion from Nolan, a harsh man who doubts her intentions as she struggles to save someone named Jensen. She admits her long-standing feelings for Nolan, but he remains cold and distant. Suddenly, a crisis unfolds when Nolan orders her to be taken to a mass grave after she supposedly dies in his carriage. In a shocking turn, she reveals she is alive, confronting Nolan's cruel plan. Nolan then unexpectedly smiles and escorts her to the Chancellor Mansion, presenting her with a bruise-covering love token, hinting at a complicated shift in their relationship that remains uncertain.
Yuna confronts Nolan, accusing him of using her, but he refuses to help her since he’s not allied with her family. Determined to form an alliance with Nolan to save Jensen, Yuna seeks to discover what Nolan truly likes. Unable to get information directly from Nolan’s intimidating household staff, she turns to Cyrus for help. Cyrus reveals Nolan rejects female admirers and likely feels insecure about intimacy. Interpreting this, Yuna sends Nolan a mysterious invitation to a banquet. Nolan dismisses the offer at first, but his hesitance hints at an inner softness beneath his tough exterior.
Yuna arrives at a venue only to find it double-booked for a private banquet hosted by Prince James, triggering a confrontation as both parties refuse to leave. Yuna demands to stay, sparking tension when guests begin to question her reputation for meeting many men despite being unmarried. Prince James supports Yuna, ordering the others out. The conflict escalates when a man insults Yuna by comparing her to the eunuch Lord Nolan, who is warned as a ruthless killer. The episode ends with Yuna defiantly challenged and facing pressure over her connection to Nolan and the upcoming marriage.