Mystic Messenger is one of my all time favorite mobile games and it's made by Cheritz, a small Korean game dev studio. It's a story-telling otome game with a lot of mystery.
I play it in English but you can change the text language to Korean at any time in the settings. Also, all of the audio and phone calls are by Korean voice actors which I love.
It's quite popular, so you may have already checked it out, but if you haven't, here's the link if you're interested 😊
https://apps.apple.com/us/app/mystic-messenger/id1116027365
