A pair of Twins Shin and Koro there names both mean heart.
Their family was in horrible debt to the king so Shin was forced to be sold as a slave to work in the palace. Koro hated his parents after they told them, he didn't want to leave his brother or risk being sold off to a different house later on so he asked them to take him as well, so they were both sold off to the same house to work together.
An older drawing I did like 2 years ago while I was still practicing, I feel like I should post it though ><