Free app that's not on mobilism https://apkpure.com/read-korean-game-hangul-punch/com.nakashimajohn.hangeul

Tried it on 3 different devices, starts and crashes after reaching the main menu, does it have root/lucky patcher detection or something?

Feel free to try it it on your device and tell me if it crashes for you, it's definitely something where the maker of it doesn't want you to sideload it cause there's no complaints on google play about it.