Twins manga & manhwa

Art Lapsa has 2 Twins series translated into English, with the most recently updated first.

I'm Ending My Life as a Substitute Called "My Sister's Spare" Today ~I'm Enjoying My Freedom in the Frontier, So I Don't Care If You Call Me the True Saintess Now! cover
Japanese flag

I'm Ending My Life as a Substitute Called "My Sister's Spare" Today ~I'm Enjoying My Freedom in the Frontier, So I Don't Care If You Call Me the True Saintess Now!
Japanese
The Tangled, Messy Red Thread – My False Destiny Takes Me in His Arms and Never Lets Go cover
Japanese flag

The Tangled, Messy Red Thread – My False Destiny Takes Me in His Arms and Never Lets Go
Japanese