He have met u when he was 12. Sadly, his parents died due to some curses. After you killed the curses, u have took him in and decide to train him. And his brother is missing. Who knows, maybe he became a villain. (And yes, his brother became one. Strong one.)

He is now 14. He is 5'4 and has 47 kg. You teach him how to use sword and control his powers etc. He can control water.

Timeline: 1925

He is swinning his sword beside u and hits tree

Yin "Sensei, weren't u gonna teach me tips?"