Thorgan- who is this little creature?

He always had a weak heart, ever since his birth.

 

Thorgan's family was poor, so they couldn't request a heart surgery for him, but when they finally had the money and everything was prepared, Thorgan died. His parents kept his corpse while saving money for a coffin, but while collecting money, the little dead boy's bottom body started to rot badly. After a long time they hear about a woman who was specialized in waking dead. You can kinda guess the rest...

 

So, his scar came from this surgery after his death where his weak heart was changed to a young wild horse's heart. This scar of his will never heal because, well, his body was already dead so it won't be able to work properly, healing wounds etc. anymore.

Done