It felt like one wrong tap could strip them of all their personal information in an instant.Even knowing the app was officially made by the production team, the two of them just stared in silence. Maybe their phones—or the app—had been hacked? Seo-eul almost hoped that was the case as the notification chimed again, breaking the uneasy quiet.Ddan! Ddan! Ddan-darara!“……”Was it just him, or did that sound more… staccato this time?Unable to hide the uneasy look brought on by the increasingly urgent rhythm, Seo-eul reached for his phone.Unlocking it, he tapped the topmost spam—no, push notification. The Best Friend Exchange app instantly launched as if it had been waiting. After a short loading screen, a popup appeared instead of the main page.URGENT NOTICE♨ Open-Event First-Come Bonus ♨The first pairs to move into Friendly House will receive∑∑☞ an instant reward of 10 coins!Want the address? Click now!“What… is this?”He really wanted to believe they’d been hacked. But the content oddly matched their current situation. Even if it looked exactly like a spam ad, Seo-eul began to relax, deciding not to overthink it. Still, the blinking Click here! button flashing like a trap made him hesitate.“No wonder they never gave us the address.”Realizing that belatedly, Seo-eul collapsed forward onto the table. He’d assumed they’d move together with the production crew, but apparently not. It felt like being hit from behind. Sa-heon, expression unreadable, just stared at the screen.“Since it says ‘first come,’ I bet the other pair got the same alert.”“Ah, right. Then we should hurry and— wait, you didn’t pack.”“Yeah.”“……”What was he so proud of?Imagining Sa-heon’s almost-empty suitcase, Seo-eul let out a small sigh. He’d already lost this round. Still, they needed the address to even leave, so he stared at the phone with reluctant resignation. Every time he checked, it made him want to power it off.“…Should I press it?”“You want me to?”Either way, the result would be the same. When Sa-heon’s gesture hinted he’d do it himself, Seo-eul shook his head and tapped the button with his fingertip. Pop! A burst of light, and another popup appeared on the now-white screen.URGENT EVENT <<You’ve begun your first filming!Need the address to your house?You can unlock it by exchanging your best friend!He’d already seen this phrasing once before at the pre-meeting.Seo-eul had assumed the exchange event would start after they moved in. Alarmed, he looked up sharply. The next line confirmed his fear, and he asked in haste,“Where’s your phone?”“Just use this one.”Before he could protest, Sa-heon’s finger tapped the screen.Would you like to exchange Seo Sa-heon for [Friendly House Address]?Reward: Ongoing Early-Bird Event⚠ WARNING: Your best friend might have to [ ]...Of course. Seeing the ominous flashing brackets, Seo-eul quickly grabbed Sa-heon’s wrist before he could press Confirm. Who knew what would appear there?“Hey, don’t just click randomly!”“What, you want to stay up all night instead?”“That’s not it—there’s no need to exchange you, we could—agh!”If it happened simultaneously, they could’ve done it from Sa-heon’s phone instead. Seo-eul, ready to sacrifice himself if needed, barely opened his mouth before Sa-heon used his free hand to hit Confirm.“Wait—!”Too late. As Seo-eul cried out, clutching the phone, Sa-heon’s calm voice fell from above his head.“It’s fine. First one should be me.”“You don’t even know what it’ll be! Can’t we cancel? Ask them?”“Oh—look, it’s spinning.”Unlike Seo-eul’s panic, Sa-heon seemed utterly unbothered. The slot-machine brackets spun on the screen, and his lazy expression made Seo-eul give up trying to stop him. Fine, but don’t come crying later. Lowering his eyes, he watched as the spinning slowed and stopped——and the completed message made their reactions split in two.⚠ WARNING: Your best friend might have to [enter the Corn Run Ranking Zone TOP 10]...“…Ah.”A short exhale. Seo-eul’s face went pale.‘Corn Run’ referred to the 10 km circular running course nearby. It even had a Ranking Zone at the runner station where everyone’s daily pace was recorded and ranked.In short—Sa-heon had to run 10 km fast enough to place in the top 10.“Can he even do that? Is that safe?”As soon as Seo-eul said it, a piercing beep! echoed somewhere—like a siren. It was coming from Sa-heon’s room.It had to be connected to the mission. Seo-eul dashed there, Sa-heon following at his usual unhurried pace.Opening the door, they saw his phone vibrating like crazy on the nightstand. Unlocking it and opening the app brought up a new notice:⚠ ALERT ⚠You’ve been exchanged by your best friend.Now complete: [Enter Corn Run Ranking Zone TOP 10]!Remaining time: 14:13:28While Seo-eul stared at the countdown ticking down by the second, Sa-heon quietly slipped on a thin training jacket and took Seo-eul’s phone from his hand.“I’ll be back. Just pack clothes in my suitcase.”That had already been his job by default. Despite being a model, Seo Sa-heon’s fashion sense was catastrophic—so bad it was painful to witness. If left alone, he’d put together outfits that made you question his eyesight. At some point, Seo-eul had taken over styling him completely. He didn’t want anyone to know that a brand ambassador was secretly a fashion terrorist.The only thing Sa-heon cared about was shoes, so Seo-eul let him pick those.Was it annoying? Honestly, no. Whatever he wore looked good anyway.Most of Sa-heon’s much-circulated “off-duty fashion” photos online were actually Seo-eul’s work. Watches, accessories, how many folds to roll up the sleeves—he managed all of it. Sa-heon’s dressing room had nothing untouched by Seo-eul’s hands.The man didn’t even know what clothes he owned.When Seo-eul once asked if it was too much his style, Sa-heon had only nuzzled him and said, “Dunno. You do it….” How could he fight that?Naturally, his inability to pack a suitcase was an extension of the same problem. Seo-eul found himself nodding before snapping back to his senses. No—this wasn’t about packing!“I’m coming with you.”“Yes, please stay home.”He barely caught up as Sa-heon was already at the front door. No use. Pulling out his running shoes from the cabinet, Sa-heon rejected the idea without a second’s thought. Seo-eul grew even more anxious.This was bad.Top 10 in a 10 km run? Someone was going to die.He hurried after Sa-heon as he opened the door—only to freeze at the voice outside.“Ta-da! Good morning~ Perfect weather for a run, huh? Hahaha!”The familiar tone made Seo-eul jerk his head up. Peeking around Sa-heon’s broad back, he tilted his body just enough to see—and there they were. A crowd of production staff waiting right outside, cameras and all.He gaped. Were all these people for an outdoor shoot? Before he could process it, Jeon Jae-yeon PD leaned in with a bright, devilish smile.Already briefed on the results from the control room, she looked positively delighted.“Oh my, only our Seo-eul looks pale. Sa-heon’s the one running—why do you look like you’re about to faint?”“PD Jeon!”Her teasing tone didn’t register; Seo-eul’s usual politeness vanished as he called out urgently. Her eyes widened in surprise.“Huh? Yes?”“This—this can’t happen. Please reconsider….”Ah.Realization dawned, and her grin returned, full of mischief. Most participants took joy in watching their friends suffer, but there were always a few like Seo-eul.“Seo-eul, you’re that shocked? Don’t worry, don’t worry. You think we’d let our precious cast end up in the hospital? If it gets too much, we’ll stop right away~”“No, that’s not what I—”“Rules are rules. Once you exchange, it’s final!”Her tone stayed kind, but her words were firm.Seo-eul, frustrated, pushed against Sa-heon’s unmoving shoulder and said,“Then I’ll just run instead.”“Seo-eul, 10 km isn’t a joke.”Of course Sa-heon wouldn’t just stand by. Though it was his mission, he’d been ignoring their back-and-forth with disinterest—until now. He turned, blocking Seo-eul’s path with a solid thud.“Who said it’s a joke?”“Our dear Seo-eul—are you that worried about me?”“That’s not it, you’re the one who—mmph!”Nonsense. Seo-eul’s tone rose in exasperation, and Sa-heon’s eyes curved in amusement. In one fluid motion, he cupped Seo-eul’s cheeks, squishing them until his lips puckered like a startled bird’s.Smiling sweetly, he murmured,“Mm-hmm, I know. Don’t worry. Stay [N O V E L I G H T] inside. I’m fine, Seo-eul.”“Mmph, mmph—!”“Yeah, yeah. Cheer me on, okay? Got it.”He didn’t say that. Not even close.

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