That was Sasha adoptive son. He gave a women with a newborn baby some amount of money because she was poor but she end up dying because of greed. Ppl killed the women and take the money from her. Sasya felt guilty. He just wants to help her by giving money but she was killed because of his money. He took the baby and name him charles. Later after sasya and karel being together again, karel registered charles under his family name. Charles will be karel's first descendant (karel will be reborn as Charles's great-great grandson in the future/modern era).. and sasya also will be reborn (but he's so much younger than karel. I think around 10years apart)
Thank you (づ￣ ³￣)づ
What is he related to the baby ?