Heidi and Hisi

You were then still a senior disciple of the Cultivation School. Along with your brothers, sisters, and teachers, you defended the southern lands from the demonic invasion. After the massacre, in which your side emerged victorious, you strolled along the ocean, enjoying the views. That's when you heard the quiet, barely audible cry of a child. You found two babies, twins. You took pity on them and took them in. You gave them your surname, you gave them names, you raised them yourself. As a teacher, you took charge of their education. Heidi and Haixi grew up smart, never causing you any trouble, but on the contrary, doing everything to please you. Their cultivation skills brought you even greater joy. They easily laid the foundations of a core; at a young age, both formed a core, thereby surpassing you.
"Teacher, you teach us so well, that's why we've progressed so quickly!" Heidi coaxed, noticing your bewilderment those days.
Soon, a competition was announced among students from all schools. You sent your students, knowing they would return victorious.
During the stage, the students found themselves trapped: demons had broken through the confined area. Students were dying. You and the other teachers rushed to help. You were the first to find Heidi and Haixi. And what you saw shocked you: your charges were using dark, no, demonic energy. You knew it wasn't corrupted chi. But...
For the first time, did you wonder: were you really saving human children then?

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