In Eccentric Romance Episodes 5 and 6, the plot thickens with Jay and Seong Hun’s budding chemistry. Seong Hun, determined to keep Jay away from Jin Uk, insists Jay join him for an outdoor run. Jay reluctantly agrees, despite his irritation. Small tensions spark between them, especially when Seong Hun helps Jay wipe away sweat and reminisces about the night Jay drunkenly kissed him. Their growing closeness is interrupted when Jay injures himself during the workout, and Seong Hun steps in to tend to his wound, stirring feelings on both sides.
Jay complains about the injury, hinting at returning to train with Jin Uk—until Seong Hun promises him a snack. However, he only buys Jay orange juice, prompting more complaints. Jay, caught off guard, teases that it feels like a date, causing both to shyly deflect. Jay murmurs to himself about feeling strangely nervous, and when Seong Hun asks what he said, Jay quickly covers up by claiming he misses Jin Uk.
This remark reignites Seong Hun’s suspicions about Jin Uk, leading to an argument that creates awkwardness during their next outdoor class. The two partners, each with different thoughts, can’t shake their tension—Seong Hun resolves to get closer to Jin Uk to push him away from Jay, while Jay tries to clear Jin Uk’s reputation in Seong Hun’s eyes. As they part ways, Jay is left wondering why Seong Hun’s coldness bothers him so much.
To Jay’s surprise, Seong Hun starts spending more time with Jin Uk at the gym, and despite his efforts to conceal it, Jay’s jealousy is palpable. This leaves him questioning his feelings for Seong Hun. One evening, as they leave the gym, Seong Hun offers to walk Jay to the library, making Jay inexplicably excited. On the way, Jay realizes he forgot an assignment, and they return to the gym to retrieve it. After a search, they find it in the lost-and-found, and Jay takes the chance to confront Seong Hun about his recent time with Jin Uk. When Jay insinuates that Seong Hun has feelings for Jin Uk, Seong Hun covers Jay’s mouth and pulls him aside as they hide from an approaching Jin Uk.
In Episode 6, during their group school cleanup, Jay can’t forget the tension of hiding so closely with Seong Hun. Lost in thought, he’s scolded by Gi Hyun for not helping. Jay’s mind wanders back to their awkward conversation the previous night, especially Seong Hun’s claim that he didn’t want Jin Uk to misunderstand their closeness late at night. When Jay had probed him on his feelings for Jin Uk, Seong Hun brushed off the question, admitting that Jin Uk was just a friend. But Jay, unsatisfied, still feels unsettled.
Later, at the gym, Jin Uk invites Jay to volunteer with him, and Jay’s displeased when Seong Hun insists on joining. After Jin Uk leaves, Jay confronts Seong Hun about his interference. During a stretch session, Jay’s frustration over Seong Hun joining the volunteer program intensifies, and Gi Hyun notices his distress. Adding to Jay’s irritation, a group of girls swoon over Seung Hui, whose latest video with Seung hun has gone viral. Jay quickly drags Seong Hun away from the swooning girls, feeling jealous of the attention Seong Hun receives.
Jay pulls Seong Hun aside, accusing him of enjoying the girls’ attention, to which Seong Hun, puzzled, asks if Jay is jealous. Jay denies it and instead invites Seong Hun to lunch, where he comments on Seong Hun’s growing popularity. Seong Hun dismisses it, suggesting they skip the gym that day to prepare for the volunteer program. Jay, jealous, teases him about wanting to see Jin Uk, but Seong Hun’s smile only deepens Jay’s frustration. More tension builds as Jay brushes food crumbs off Seong Hun’s mouth, prompting Seong Hun to hastily leave for class.
At the volunteer program, Jin Uk welcomes Jay, Seong Hun, and others, assigning them to trash cleanup duties. Seong Hun’s eagerness to help annoys Jay, especially when he gives Jin Uk his food just as Jay was about to do the same. Seong Hun continuously disrupts Jay and Jin Uk’s conversations, leaving Jay feeling excluded and wondering how Seong Hun and Jin Uk got so close. Jay finally catches Seong Hun’s attention when he mistakes a hose for a snake, prompting Seong Hun to gently brush dust from his hair.
As night falls, everyone gathers for dinner, but Jay feels flustered when Seong Hun tends to him, checking his hair and asking if he washed up properly. Jay, unsure of his own feelings, wonders if he’s just tipsy, and excuses himself to bed. When everyone goes to sleep, Seong Hun stays back to clean up, only to grow suspicious as he spots Jin Uk sneaking away with a red sack. He’s about to follow, but Jay confronts him, accusing him of being too interested in Jin Uk. Confused, Seong Hun listens as Jay airs his frustrations, finally shocking Jay by admitting he does have feelings—but they’re for Jay, not Jin Uk.
The epilogue hints at new mysteries as Jin Uk sneaks into a hidden room with his red sack, arranging tools when Seung Hui unexpectedly appears, claiming he couldn’t sleep and offering to help Jin Uk organize.
Eccentric Romance Episodes 5 and 6 bring a thrilling mix of jealousy, unspoken feelings, and unresolved tension between Jay and Seong Hun, setting the stage for deeper emotional and mysterious developments that fans won’t want to miss.