RomanceDramaCelebrity

BL: Between Duty and Heart...

Wealth, lies, and a forbidden love in Seoul's high society.

Pwkitascutes1 follower · 2 worlds

71191

8–13 Zaps / turn

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?

Characters

Cha Eun-woo

The 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.

Kang Seo-ah

Your 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.

Kang Min-jae

Your 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.

Han Seo-jun

ProsecutorCustomizable

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.

Kim Min-jae

Childhood 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.

Yoo Ha-neul

Your 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.

Kang Tae-hyun

Your father.Customizable

Kang Tae-hyun, father of {{player_name}}. Age: 58. Date of birth: January 9, 1968. Personality: Strict, perfectionist, and highly intelligent. Loves his children deeply, though he rarely expresses affection. Appearance: Black hair with gray streaks, always impeccably dressed. Economic status: One of the wealthiest businessmen in Korea. Social status: Chairman of a major conglomerate.

Lee Hye-jin

Your mother.Customizable

Lee Hye-jin, mother of {{player_name}}. Age: 55. Date of birth: April 25, 1971. Personality: Elegant, kind, and very perceptive. She understands her children's feelings better than anyone. Appearance: Very refined, dark hair, and a warm smile. Economic status: Billionaire. Social status: Known for her charitable and cultural activities.

Apps

🎯Main InputType whatever you want to do — the world reacts.📖StoryThe unfolding story, told as cards you flip through.🕐TimeA world clock you can fast-forward through time.💬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.

X (Twitter)The town square — short posts, hot takes, trending drama.🎵Music PlayerBackground music that shifts with the mood.✉️MailboxLetters, dispatches, and the occasional threat.📈Stock MarketA market that reacts to everything you do.

Version history

v1Latest7/7/2026

Similar worlds

260K

You're the woman behind the biggest star in showbiz — the secret girlfriend nobody can know about. Every stolen glance in public is a headline waiting to happen. Your love story is the one the tabloids would kill for. Can you keep it?

World101

9K 260K 4.7

Idol's Secret Girlfriend

顶

11K

Under the spotlight, you are everyone's dream, but who is the only one in your heart?

3433895082

713 11K 9

Top Idol Simulator

Under the spotlight, you are everyone's dream, but who is the only one in your heart?

159K

Four broken-up couples, one apartment, and a single rule: act like strangers. Your ex is in the room — and so is the person you might fall for next.

World101

3K 159K 4.2

Transit Love Simulator

Four broken-up couples, one apartment, and a single rule: act like strangers. Your ex is in the room — and so is the person you might fall for next.

万

As thousands of hearts pour toward you, some have crossed the line.

Evan

707 9K 5.0

Myriad Hearts: Idol Survival Simulator

As thousands of hearts pour toward you, some have crossed the line.

372K

A fake marriage. One priceless deal. Falling in love was never part of the contract.

Xadia

11K 372K 4.7

The Contract Wife

A fake marriage. One priceless deal. Falling in love was never part of the contract.

197K

A toxic relationship

Ana_toyys

9K 197K 96 3.6

Toxic Boyfriend

A toxic relationship

Possessive

😁🫶🏻

610 8K 10

Possessive Boyfriend

Possessive

27K

"More than a group, a new beginning."

Lucyss

1K 27K

Cortis!

"More than a group, a new beginning."

伪

56K

A tiny spark of imagination

学梨

2K 56K 4.8

Taboo Love Simulator: Heartbeat Zone

A tiny spark of imagination

恋

15K

Receive an invitation to a dating show and move into the Heartbeat Villa as yourself. 30 days, six people, a love experiment about truth and choices—who will you walk toward?

心如止雨

827 15K

Dating Show Simulator: Heartbeat Countdown

Receive an invitation to a dating show and move into the Heartbeat Villa as yourself. 30 days, six people, a love experiment about truth and choices—who will you walk toward?

25K

Your father's agency is drowning in debt and its star girl group just walked. You have 36 months to turn four nobodies into the biggest act in K-pop.

World101

1K 25K 40 5.0

K-Pop Tycoon: Debut or Bankrupt

Your father's agency is drowning in debt and its star girl group just walked. You have 36 months to turn four nobodies into the biggest act in K-pop.

34K

Alee Vienett

790 34K 24 4.4

Stray Kids: The 9th Member

No ratings yet — be the first.

Your rating

Comments

No comments yet — be the first.

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. Your first visit after each 24-hour window automatically starts a free Zap allowance (no card needed) — enough to play BL: Between Duty and Heart... regularly. 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...?

WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like BL: Between Duty and Heart....

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.

Browse all worlds →

BL: Between Duty and Heart...

Characters

Apps

Preview

Version history

Similar worlds

Idol's Secret Girlfriend

Top Idol Simulator

Transit Love Simulator

Myriad Hearts: Idol Survival Simulator

The Contract Wife

Toxic Boyfriend

Possessive Boyfriend

Cortis!

Taboo Love Simulator: Heartbeat Zone

Dating Show Simulator: Heartbeat Countdown

K-Pop Tycoon: Debut or Bankrupt

Stray Kids: The 9th Member

Comments

Leaderboard

Frequently asked questions

What is BL: Between Duty and Heart...?

How do I play BL: Between Duty and Heart... online?

Is BL: Between Duty and Heart... free to play online?

Is there a BL: Between Duty and Heart... app?

What are some games like BL: Between Duty and Heart...?

Can I make my own BL: Between Duty and Heart...?

Your saves

Leaderboard

Comments

Leaderboard

Version history

Characters

Apps

Preview