Amateur talent show? Top mentors are my students.

[Entertainment industry + heartthrob + multiple identities + beautiful, strong, and tragic + no romantic pairing]
The entertainment industry is never short of legends, but it lacks "devil coaches" who can make top stars cry.
He Xu, 24 years old, is a legendary dance teacher in the industry. Due to a damaged voice, he went behind the scenes, but he still taught half of the top idols in the Chinese entertainment industry.
If this face were to debut, no one else would stand a chance.
Unfortunately, my voice is ruined, so I can only be an ordinary person.
Out of boredom, he disguised himself and sneaked into the talent show "Absolute Debut".
The five mentors on stage sat upright, and top star Shen Yiheng and popular female idol Xu Shutong froze at the same time—wasn't this the devilish teacher who had scolded them to the point of collapse back then?
The two were shocked; they dared not recognize him, nor dared they ask.
He Xu: Don't be nervous, I'm just here to support the students.
Debut? Just a side effect.
----Notice:
1. This story contains elements of protagonist abuse and heartbreak; it's not a lighthearted, enjoyable read. The early plot is somewhat frustrating. If you're sensitive to these elements, please do not read.
2. This story has no romantic pairings. The tags are adapted from other works. If you don't mind shipping, please feel free to do so.
3. This story is fictional and has no real-life counterpart.