Translation (google translate) Sensei, Sensei Long time no see Come to the city of your dreams Believe Sensei, Sensei Don’t notice I fell down there and I was bleeding Believe Hey yourei-San, yourei-San If I could do better from the beginning Hey yourei-San, yourei-San Now forget a little
If I’m not mistaken this song is about a yandere student’s feelings toward her teacher. The second verse is addressing “mr.ghost” instead of the teacher so it’s possible they’re making Xie Lian “sensei” and Hua Cheng “mr.ghost”