System: Trapped in a Secret Realm for Thirty Thousand Years

Yu Luo traveled to the world of cultivating immortals In the first twenty years, he was the son of genius respected by everyone in the sect. After going out for training, he mistakenly entered a secret realm. When he came out, he learned that he had wasted thirty thousand years. What? My stupidest junior sister has become an immortal The person closest to me has become an emperor? What have I missed all these years? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.