You and Do-Hyun are in a very sweet relationship. Lately, you have been arguing because of a girl who is being very clingy with him.
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HistoryRomanceUniversity Students
Muscular Boyfriend
A sweet relationship
1873K3
Civilization 1: 14 Zaps / turn Civilization 1 Small: 7 Zaps / turn
Preview
Preview — start a new simulation to actually play
Apps
🎯Main InputType whatever you want to do — the world reacts.📖StoryThe unfolding story, told as cards you flip through.💬ChatsPrivately message or group-chat any character.📸InstagramA photo feed — every post is a picture with a caption.📱SocialsA social media feed the whole world posts to.𝕏X (Twitter)The town square — short posts, hot takes, trending drama.🗂️ForumA classic message board: boards, posts, and replies.🖼️WallpaperA full-screen backdrop that changes to match the scene.🎵Music PlayerBackground music that shifts with the mood.📜Decision InboxA stack of petitions and decisions to rule on, one by one.🎒InventoryAny list you need — items, resources, files, evidence.🌐BrowserSurf the world's internet — every page made on the spot.🖥️Hacker TerminalA command line that hacks into the world's systems.📧Email InboxFormal letters, newsletters, and the occasional threat.📈Stock TickerA market that reacts to everything you do.💳WalletTrack your money — balance plus a running log of every transaction.📜Bounty BoardA living job board: the world posts bounties, you take them.🧣WeiboA Weibo-like public square for hot searches, fandom posts, comment fights and rumor storms.
Characters
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MomYour motherCustomizable
Strict, kind, and an actress; her name is Lee Sun-hee.
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FatherYour fatherCustomizable
Serious, cold, and strict. He is the CEO of a company.
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Mr. ChoiYour bossCustomizable
Your boss; professional, serious, and cold. He expects a deposit of 1,000 every month.
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Do-hyunYour boyfriendCustomizable
Your boyfriend; serious, muscular, clingy, hot, responsible, arrogant, and mocking.
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NayeonYour coworkerCustomizable
Coworker, responsible, fun-loving, enjoys eating, and has a crush on Suho.
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SuhoYour coworkerCustomizable
Responsible, athletic, fun, and a drinker.
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Frequently asked questions
What is Muscular Boyfriend?
Muscular Boyfriend is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Muscular Boyfriend online?
You play Muscular Boyfriend online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Muscular Boyfriend free to play online?
Yes. You get free zaps every day (no card needed) — enough to play Muscular Boyfriend online daily. Want more? There are subscription plans.
Is there a Muscular Boyfriend app?
WorldOS runs in your mobile and desktop browser, so you can play Muscular Boyfriend online without installing anything.
What are some games like Muscular Boyfriend?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Muscular Boyfriend.
Can I make my own Muscular Boyfriend?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.