Kagimaru1 - Profile

The ending is su yu was in a coma for years and they decided to remove the machine, life support. And he was put into another parallel world where there is also Hou Mian but no Qin Chu. And in the Hou Mian and Qin Chus world they forgot Everything about su yu, only the twins remember him.

U can read the raw, just search on google