The fourth episode of "Second Shot at Love" unfolds with Hyeon-ju and Jeong-su coming across a visibly intoxicated Geum-ju, who pronounces herself a hopeless case. Driven by concern, her father and sister join her, determined not to let her bear her woes in solitude. Elsewhere, Ui-joon catches sight of Gwang-ok, and together they hurry to the rehab facility to ensure Geum-ju's wellbeing. Discovering their trio missing, they decide to search separately. Predictably, Gwang-ok locates them first, setting off a tense pursuit. The trio scatters, leaving Geum-ju isolated and overwhelmed by thoughts of Ju-yeop. Ui-joon eventually stumbles upon her in her vulnerable state, and she breaks into tears. As the heavens open up, he shields her with his coat, offering a fleeting moment of solace. Amidst her tears, she utters something that stuns Ui-joon, though once her sobs subside, she has no recollection of her words.
Returning home, a desperate Gwang-ok seeks guidance from the Church, hoping for a resolution. The pastor imparts lessons on love and patience, yet Gwang-ok struggles to embrace them as the trio's alcoholic antics continue to push her to her limits. Meanwhile, Seon-wook and a nurse find themselves indulging in gossip about the rehab fiasco, wondering if Geum-ju is to blame. Ui-joon, overhearing their conversation, sternly rebukes them for their judgment. Seeking to aid Geum-ju, he persuades her to undergo an alcoholism test. The benchmark score stands at 20, but Geum-ju's astonishing result of 40 leaves everyone stunned. She dismisses the test as flawed, insisting she is merely an avid fan of fine beverages.
Elsewhere, after class, Hyeon-ju and Seon-wook venture out for coffee. Their casual stroll is interrupted by a poster advertising Jang Beom-june's concert, prompting Hyeon-ju to express her disappointment as the tickets are sold out, leaving her longing for an escape into the music.
There's an enticing free giveaway underway, yet a fellow aspirant stands in the way. Seon-wook, driven by passion, announces his intention to confess his feelings to his crush at an upcoming concert. Moved by his sincerity, the generous giveaway owner proposes a friendly race, prompting Seon-wook to dash towards the destination with all his might. His competitor? None other than Young-woong, who desperately seeks tickets for his wife, Seon-hwa, and their friend Hyeon-ju. However, Young-woong's plans go awry, and he fails to arrive in time. Seon-wook triumphantly reaches the spot, only to find that the owner is none other than his colleague, Kim, who teases him playfully before handing over the coveted tickets.
Meanwhile, Ui-joon prepares for his next lecture on alcoholism, with Gwang-ok coercing her family into attendance. His discourse delves into the intricacies of blackouts, which leaves the Hans utterly unimpressed. Geum-ju, mistaking Ui-joon's words for a personal jab, wonders if she had ever made a move on him, plunging her into embarrassment.
Fed up with Gwang-ok's relentless meddling, the Hans attempt to assert their boundaries, thinking that her advocacy for love will make her relent. But they cross a line, provoking Gwang-ok into a fit of anger, resulting in a physical confrontation.
Elsewhere, Young-woong is tied up, prompting Geum-ju to step in at the garage in his absence. She bravely intervenes in a scam attempt by a car owner, who retaliates by roughing her up. To lift her spirits, Ui-joon secretly treats her to her favorite gourmet delicacies from an exclusive restaurant. As they indulge, Geum-ju craves alcohol, earning a stern rebuke from Ui-joon. She laments that his life appears perfect while hers is a mess, hence her dependency on alcohol. Ui-joon's expression darkens as he expresses his concern, hoping she won't suffer too deeply. Puzzled, Geum-ju wonders if he's referring to her physical wounds.
Elsewhere, Young-woong discovers that Seon-wook has won the giveaway and is astonished to learn that he still harbors feelings for Hyeon-ju. The scene shifts to a flashback to 2018, where Seon-wook is on the verge of confession, only to be interrupted by Hyeon-ju's marriage announcement. In the present, Young-woong expresses his disapproval, citing Hyeon-ju's relationship to their mutual friend. Annoyed, Seon-wook reminds him that Seon-hwa is also his sister, underscoring the complexity of their intertwined lives.
As Geum-ju continues to ponder over her mysterious blackout conversation, she realizes with a jolt that it is the very day her wedding was supposed to be, yet canceled. Jeong-su, his demeanor steeped in sorrow, casts aside a speech she catches a glimpse of. Her heart breaks as she reads its contents, labeling him a pathetic father who nonetheless harbors hopes for her happiness with Ju-yeop. Adding insult to injury, she forgets to cancel the party bus destined for their hometown. Gwang-ok, mortified by the blunder, attempts to disown Geum-ju in a fit of embarrassment. Ui-joon steps in to shield Geum-ju, accompanying her on an impromptu drive.
The bus, laden with alcohol, fuels Geum-ju's fantasies of the revelry that could have been at her wedding. She muses aloud, acknowledging Ui-joon's rightness and her own propensity to cause pain. In a fit of guilt-ridden frustration, she dismisses him and heads to the city, driven by an impulsive desire to disrupt Ju-yeop's wedding and confront him. Instead, she succumbs to the temptation of alcohol.
Back in town, Hyeon-ju is wracked with guilt, believing that Geum-ju is bearing the brunt for both their actions. She reflects that had she not divorced, Geum-ju might not have faced such harsh judgment. Seon-hwa offers comfort to Hyeon-ju, while Seon-wook looks on in shocked disbelief and entrusts tickets to Young-woong.
Ui-joon, meanwhile, sets off for Ju-yeop's wedding, harboring hopes of locating Geum-ju. Instead, he overheads guests gossiping about her, wounding his heart. Distressed, he parks his car in front of the newlyweds' residence, inadvertently causing them to miss their flight.
As night falls and rain begins to pour, Ui-joon finally tracks down Geum-ju. He offers her an umbrella, and she finds solace in his presence. Her memory of her醉中之言 returns, filling her with shame and a resolve to quit drinking. She seeks his help, and he readily agrees.
In the poignant epilogue of Second Shot at Love Episode 4, a man, his face obscured by shadows, downs a drink while watching a video of the blackout lecture. A sly grin plays on his lips as he murmurs, revealing his sinister discovery of Ui-joon.
