Play It! The Flute!

They say youth always comes with regrets, like the euphonium that never sounded at Kitauji.

Yang Lin: Give me a break. I had regrets before I came here, and I still have regrets after coming here. So what was the point of coming?

A transmigrated male lead with a harem. A happy family ending where everyone gets together. The male lead is cautious about potential pitfalls, and the other characters won't be too extreme.