Episode 5 of "Pump Up the Healthy Love" kicks off with a scene where a little boy enters the gym, sweetly calling Hyeon-joong "Daddy."Shortly afterward, the boy's mother, Hye-bin, bursts into the gym, panting and explaining that her son had bolted off on his own. However, her appearance betrays a palpable exhaustion, and she nearly collapses. After urging her to take a much-needed rest, Hyeon-joong notices her desperate need for exercise. Given that she has no one to watch over Ji-ho, Hyeon-joong graciously volunteers to babysit while she gets her workout on.
At work, Ye-jin returns from her enchanting Hawaiian honeymoon, bearing gifts for everyone. While the rest of the crew receives sweets and chocolates, she presents Mi-ran with a quaint Hawaiian doll. Joon-bae then reveals that the PR team has offered Mi-ran the golden opportunity to showcase the new Hawaii tour package on Live Market, citing her expertise in the area. Someone had evidently sung her praises to the team.
Ye-jin attempts to position herself for the gig, but Joon-bae stands firm in his decision to give it to Mi-ran. Later, Ye-jin tries to undermine Mi-ran's confidence by warning her that the camera has a tendency to add a few pounds. This remark stirs something in Mi-ran, prompting her to confide in Hyeon-joong about her desire to give up flour. Skeptical, he challenges her to a bet: if she succeeds, he'll have to choke down teokkbeokki; if not, Mi-ran will have to groove on TV.
Later, Hye-bin arrives at the gym with Ji-ho in tow. As Hyeon-joong trains her, he keeps a close eye on Ji-ho. Post-session, he encourages Hye-bin to keep coming, but we catch a glimpse of his fatigue as he struggles to keep up with Ji-ho's demands.
Back at home, Mi-ran embarks on a nostalgic farewell tour of her flour-filled memories, solemnly bidding it adieu. She sets boundaries with Ji-ran and Kang Dan, requesting they keep flour out of the house. At work, Mi-ran finds herself forced to order a salad from outside. Her colleagues can't help but chuckle as she engages in a comic struggle with a tiny piece of bread in her salad.
Meanwhile, Hyeon-joong continues his training sessions with Hye-bin. He briefly hands Ji-ho over to Alex, but the toddler's tears quickly beckon him back. As Hyeon-joong steps outside, Roy appears and teases him. Their argument escalates, and in a moment of exhaustion, Hyeon-joong suddenly collapses to his knees.
Mi-ran arrives at the gym, but her demeanor clearly betrays her struggle with the flour shortage. In the locker room, her eyes fall upon a plate of delicious Korean pancakes, thoughtfully left behind by the gym's three veteran members. Frustrated, she vents her frustrations to Hyeon-joong, accusing him of exhaustion from constantly babysitting her. He, in turn, shoots back that her irritability stems from the very same flour scarcity that's been plaguing her.
Returning home, Mi-ran's irritation only intensifies when she catches sight of Ji-ran and Kang Dan indulging in jjajangmyeon. Matters worsen when she receives a text from Hyeon-joong, blaming her for the situation.
Meanwhile, Hyeon-joong finds himself haunted by a nightmare where Director Dong's voice echoes, accusing him of lacking the mental fortitude to handle Ji-ho and, by extension, the gym itself. The next morning, when Hye-bin calls for another session, Hyeon-joong feigns illness and cancels their appointment.
At work, Mi-ran meets with the show's host. Despite the host's gesture of bringing breakfast to the table, Mi-ran finds herself inexplicably distracted by the simple act of the host eating a bagel, causing the meeting to suffer.
Seeking solace, Hyeon-joong opts for an outdoor, public gym. Unfortunately, fate conspires against him as he bumps into Hye-bin and Ji-ho. Desperate to avoid detection, he ducks into a photobooth, only to accidentally crash Ji-ran and Kang Dan's photo session.
Ji-ran ushers him out and promptly demands 5,000 won as compensation. With no cash on hand, Hyeon-joong finds himself in a bind until Hye-bin steps in and pays for him. After they depart, she offers him some porridge and delivers the heartbreaking news that she won't be able to visit the gym anymore.
