The Perfect Replacement

My twin sister's been replaced! My sister is perfect — so much so that she's been chosen as the hero of another world called Rowold. While she's off saving this new world, she's been replaced by Moomyung, an aloof Rowoldian. He's not the most convincing substitute, so I'm helping him out. But I'm learning from him too. --- - [Official Simplified Chinese Translation](https://manga.bilibili.com/detail/mc28079) - [Official Thai Translation](https://www.webtoons.com/th/bl-gl/perfect-substitute/list?title_no=2871)