Episode 4 of "Jack & Joker: U Steal My Heart" kicks off with Jack embarking on his latest mission, encountering Khajorn, yet another acquaintance marred by alcoholism. Khajorn's addiction has drained his finances, forcing his daughter, Toi Ting, to abandon her studies. Unfazed, he offers Toi Ting to Jack as a bargaining chip to temporarily alleviate his debt. Jack, devoid of the necessary funds, finds Khajorn wistfully longing for Robin Hood's intervention, unaware that the elusive hero is none other than Joker, who's been returning pawned belongings to their rightful owners.
Amidst this, Tattoo attempts to relinquish Jack's ring, but Jack declines, prompting Joker to devise a plan to present it to Jack's grandmother instead. At the bustling morning market, where Grandma sells fragrant chive dumplings, Joker hesitates in offering the ring, his moment of indecision disrupted by a gang of cunning scammers attempting to swindle Grandma. Together, they fend off the scoundrels, forging an unlikely bond amidst the chaos. With Grandma's back aching, Joker chivalrously pushes her cart back to their abode.
Along the way, their conversation reveals Joker's connection to Jack and the intricate tale of a spurious loan. Grandma, insightful about Jack's passionate nature, senses a heart filled with both love and hatred, yet believes in Joker's capacity for redemption. She assures him that together, they can unravel the tangled web.
Meanwhile, Hope's investigative prowess uncovers Hoi's true identity, linking him to the getaway van rented with his actual address. Misguided by a lack of cunning, both Tattoo and Hoi erroneously suspect Jack as the mastermind. The enigmatic Boss appears, demanding the return of a necklace that holds sentimental value for his wife. Aran concocts a lie to evade the situation, but the Boss's warning lingers—should anything go awry, Aran's world will crumble.
Back at Grandma's, a heartwarming scene unfolds as she nurtures Joker with food and tales of Jack's past. The story of Jack's parents, their failed restaurant venture, and tragic demise in a desperate attempt to collect life insurance that ultimately didn't cover suicide, casts a somber shadow. Exhausted from the scuffle, Grandma drifts off to sleep, leaving Joker to tidy up the house.
Just as Toi Ting and Jack arrive, misinterpreting Joker's intentions as hostile, a tense confrontation ensues. Joker, poised to retaliate, is swiftly disarmed by Grandma's explanation that he was merely offering a soothing shoulder massage. She heaps praise upon him, extending an invitation to dinner. Jack's discomfort is palpable, prompting Grandma to mischievously assume a lovers' quarrel. Joker, ever the prankster, plays along until Jack, exasperated, pulls him aside.
Jack lays the blame squarely on Joke for all his predicaments, emphasizing that if he absconds with the ring, Boss will assume he's pilfered everything under the sun. However, Joke contends that Grandma's voice deserves to be heard in this matter and proposes a bargain – Jack should mull it over and consult Grandma; if he does, Joke vows to leave him in peace forever. Should Jack decline, Joke threatens to present the ring to Grandma without delay. Frustrated to the core, Jack reluctantly accepts the deal, taking the ring in hand. He also cautions Joke about Aran's henchmen hot on the trail of the thieves, urging him to go into hiding. Little does Jack know, Joke seizes this as an opportunity to seek refuge at Grandma's.
With Jack back to his duties, Joke embarks on repairing his battered chair and table. Toi Ting lends a helping hand, her innocent inquiry about his feelings for Jack leaving Joke utterly flustered. Meanwhile, Save makes a surprise visit, piquing the curiosity of Grandma, Toi Ting, and Joke, who remain vigilant. Jack, however, trusts Save implicitly.
Elsewhere, Hoi's escape plans are foiled as he's kidnapped by Hope's men. Tattoo and his mother find shelter at Miss Nang's shrine, where Tattoo is conscripted into dishwashing duties while his mother sells temple trinkets. A call from Hoi lures Tattoo into a trap, leading him straight into Aran's lair, where Hope renders him unconscious. Rak and Yom, Hope's henchmen, ransack the shrine, brutally beating the helpers when the necklace proves elusive. Miss Nang and her guards arrive just in time, swiftly incapacitating the thugs.
The duo rushes back, only to face Hope's ire, unaware that Miss Nang has brokered a truce with Boss. Fed up with their antics, Aran threatens Hoi with dire consequences unless he retrieves the necklace. Tattoo spills the beans, but Aran's new plan involves using the two thieves to steal the necklace back from the pawnshop. Simultaneously, Hope hacks into Tattoo's phone, uncovering their group chat.
Back at their abode, Toi Ting's vigilance alerts Jack once more to a stranger's presence, prompting him to rush home and find Coach Wah. It transpires that the taekwondo association has fallen victim to Carbon's imprisonment for assault, forcing its closure. The coach offers a heartfelt apology, lamenting his cowardice. Jack, though not fully forgiving, harbors hope for a brighter future. As the coach departs, Joke's eavesdropping is revealed. Stepping forward, he admires the repairs and glimpses his blueprint for the learning center. Toi Ting struggles with a book, and Joke offers assistance, while Grandma shares that Joke's mending of the furniture is his way of making amends.
A poignant flashback unfolds, depicting Jack's parents awkwardly yet earnestly transforming the study space, their clumsy efforts a testament to the lengths one goes for loved ones. Grandma's wise words echo, asserting that foolish deeds are often birthed from the heart's deepest affections, leaving Jack torn between emotions. As he enters the bedroom, he stumbles upon Joke muttering in his sleep, a comical sight that momentarily lightens his mood. Jack expresses his gratitude to Joke, his heart heavy with the realization that he cannot retain the ring, ultimately returning it to its rightful place and tenderly tucking Joke in.
Meanwhile, in an unexpected twist, Save and Hope, who share not just a wall but also a romantic connection, are revealed. Hope's covert plan to distribute Joke's photo in wanted posters takes an unexpected turn when Save betrays her trust. Unbeknownst to them, Toi Ting, a vigilant observer, sprints to alert Jack and Joke of the impending danger.
Elsewhere, Tattoo's mother, engaged in a shady transaction with Jennie, the mysterious vendor, flees at Jack's approach. Jack's troubled demeanor prompts the vendor to assume love's complications, offering a fortune reading that enigmatically suggests a shift in destiny for both the forgiver and the one forgiven. Before he can ponder further, Toi Ting's urgent call interrupts his thoughts.
Arriving just in the nick of time, Jack intercedes to thwart Hope and her henchmen, igniting a clash that is swiftly halted by Grandma's intervention. She cunningly orders a search, ensuring Joke's safety while the intruders depart with a stern warning.
In a private moment, Grandma confides that Joke's heartfelt letter has disclosed all. Jack apologizes for his initial intention to reclaim the ring, confessing his internal struggle. Grandma, proud of his honesty, underscores Joke's earnest desire to make amends.
Joke, having learned to make chive dumplings from Grandma's tutelage, leaves behind another heartfelt note, expressing his transformation through Jack's kindness and expressing hope for their future, though uncertain of their paths intersecting again. Jack smiles warmly at the note, his forgiveness silently acknowledged, as Grandma mischievously teases him about his growing empathy for Joke.
As Jack & Joker's Episode 4 draws to a close, Joke boldly strides into Aran's hotel, his arrival heralding a new chapter in their complex bond.