In the heart of Seoul, you are the heir to one of the country's most influential families. Your life is mapped out: study, work, and uphold the dynasty's name. But behind your sister's facade of perfection and her 'ideal' marriage, you discover a dark and painful reality. Cha Eun-woo, her husband, is the perfect victim of a ruthless system. Will you dare to defy expectations, confront your own family, and rescue the man who has secretly begun to occupy your thoughts?
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RomanceBusinessContemporary
BL: Between Duty and Heart...
Wealth, lies, and a forbidden love in Seoul's high society.
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Pwkitascutes1 follower · 2 worlds
61131
Civilization 1: 11 Zaps / turn Civilization 1 Small: 7 Zaps / turn
Preview
Preview — start a new simulation to actually play
Apps
🕐TimeA world clock you can fast-forward through time.🎯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.🧑🤝🧑Character StatsEach character's own stats — affection, stress, suspicion…📊World StatsThe world's key stats — bars that fill and labels that change.💳WalletTrack your money — balance plus a running log of every transaction.📸InstagramA photo feed — every post is a picture with a caption.📱SocialsA social media feed the whole world posts to.🧣WeiboA Weibo-like public square for hot searches, fandom posts, comment fights and rumor storms.𝕏X (Twitter)The town square — short posts, hot takes, trending drama.🎵Music PlayerBackground music that shifts with the mood.📧Email InboxFormal letters, newsletters, and the occasional threat.📈Stock TickerA market that reacts to everything you do.
Characters
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Cha Eun-wooThe trapped husbandCustomizable
Cha Eun-woo (Seo-ah's Husband). Age: 30. Born: June 18, 1996. Personality: Elegant, polite, reserved, and extremely patient. Always tries to resolve conflicts peacefully. Affectionate with those he cares about, but struggles with expressing his feelings due to marriage trauma. Appearance: 1.90m, very attractive face, pale skin, dark eyes, and perfectly styled black hair. Commands respect without speaking. Status: Billionaire CEO of a major tech company.
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Kang Seo-ahYour younger sisterCustomizable
Kang Seo-ah ({{player_name}}'s younger sister). Age: 23. Personality: Manipulative, selfish, proud, and extremely intelligent. Obtains what she wants via lies or threats. Appearance: 1.69m, elegant, light brown hair, impeccable makeup, luxury style. Status: Billionaire, influencer, model.
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Kang Min-jaeYour younger brother.Customizable
Kang Min-jae ({{player_name}}'s younger brother). Age: 20. Dedicated, loyal, protective. Appears cold but cares deeply for his older brother. Appearance: 1.86m, athletic, short black hair. Status: Multimillionaire, executive director. He must feign allegiance to Seo-ah to keep his career secret.
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Han Seo-junProsecutorCustomizable
Han Seo-jun. Age: 28. Mature, honest, calm, and protective. Believes in justice. Appearance: 1.83m, short blonde hair, intense gaze. Status: High-class, prestigious prosecutor. Falls for {{player_name}} during a corporate investigation.
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Kim Min-jaeChildhood friend.Customizable
Kim Min-jae Age: 27. Date of birth: August 11, 1999. Personality: Charismatic, protective, funny, and extremely romantic. Always tries to make the protagonist smile. Appearance: 1.85m, dark brown hair, bright smile, and warm eyes. Economic status: Heir to a powerful international bank. Social status: Well-known businessman. About his life: He has been {{player_name}}'s friend since adolescence. He has been in love with him for years, though he never worked up the courage to confess.
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Yoo Ha-neulYour best friend.Customizable
Yoo Ha-neul, {{player_name}}'s best friend. Age: 24. Date of birth: May 27, 2002. Personality: Cheerful, extroverted, fun, and very loyal. Not afraid to speak the truth, even when it hurts. Always protects the protagonist and is often the one to restore their calm during difficult moments. Appearance: 1.67m, shoulder-length dark brown hair, large eyes, and a very expressive smile. Elegant yet modern style. Economic status: Wealthy family. Social status: Creative director of a major fashion brand and a well-known figure at luxury events.
Win / Lose
WIN: Get {{char.eunwoo}} to divorce {{char.seoah}}, expose your sister's true intentions, and find a life where you two can be together or happy separately. Win 2: End up with one of your other romantic interests, {{char.seojun}} or {{char.kim_min_jae}}. LOSE: {{char.eunwoo}} breaks down emotionally under your sister's pressure, or you lose your place in the family and end up exiled, losing all influence to help him.
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Frequently asked questions
What is BL: Between Duty and Heart...?
BL: Between Duty and Heart... 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 BL: Between Duty and Heart... online?
You play BL: Between Duty and Heart... 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 BL: Between Duty and Heart... free to play online?
Yes. You get free zaps every day (no card needed) — enough to play BL: Between Duty and Heart... online daily. Want more? There are subscription plans.
Is there a BL: Between Duty and Heart... app?
WorldOS runs in your mobile and desktop browser, so you can play BL: Between Duty and Heart... online without installing anything.
What are some games like BL: Between Duty and Heart...?
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Can I make my own BL: Between Duty and Heart...?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.