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hyo.dev

A small studio. A world of possibilities.

A little more ease.A lot more play.

We’re Hyo Dev. We make thoughtful apps for everyday life and games with stories you can step into. Welcome to our little corner of your screen.

Meet our apps & games

Made in Seoul. Played and used everywhere.

Different worlds. The same care.

Two experiences. One studio.SecondRoundBooKoo

Made by Hyo Dev

Find your next everyday favorite.

A new story to dive into. A simpler way to keep track together. Meet what we’re making.

SecondRound key art: schoolboy Doyoon and the champion in his memories
Story action RPGComing to mobile

SecondRound

A champion’s memory. A second chance.

A world kickboxing champion wakes in the body of a bullied schoolboy. Explore a Korean school, rebuild your strength, and fight alongside the friends you meet.

  • A story to step into
  • Timing-based action
  • Grow with your companions
iOSAndroidExplore the game
BooKoo
BooKoo’s calendar screen showing a demo ledger with daily income and expenses
A little clarity, every day.
Shared ledger appAvailable now

BooKoo

Your everyday money. Better together.

From your own daily spending to a shared home or a trip with friends. Record income and expenses, see the bigger picture, and keep everyone on the same page.

  • Personal & shared ledgers
  • Calendar & spending insights
  • Talk right on each entry
More about BooKoo

Hello, we’re Hyo Dev

Made for your day.And your next adventure.

We’re an independent studio in Seoul, making apps and games we want to spend time with ourselves. We care about the small details, from the first tap to the moment you come back.

Useful in real life

Less friction in everyday moments. More room for the things that matter.

Worth your playtime

Characters, stories, and the feeling of discovering something for yourself.

Better with your feedback

We listen to the people who use our apps and play our games, and keep improving.

What’s next

Small screens. Bigger worlds.

Our apps and games start on iOS and Android. We plan to bring our games to Steam and more platforms, so there’s more than one way to play.

iOS & Android
Our mobile platforms
Steam & more
Future game releases

We’re here for you

Something on your mind?

A question about an app, a thought about a game, or something you’d love to see. We’d like to hear it.

Contact Hyo Dev