i need a help =" please ="

hi every one <3 , i wanna ask bạn about a song and i hope bạn can help me to know it ="
link
it is started from 3:01 to 3:11 ="

when Jeon Ah-min(Jo In-seong)with Ham Eunjung(Yoon Baek Hee) and the Teacher , the Teacher đã đưa ý kiến : start ,
then Jo In-seong say the song ( the english lyrics in this part is :
( xin chào , just like i believe in bạn believe in my friend , therefore i to not be burdened to introduce bạn to my Những người bạn )
then the Teacher đã đưa ý kiến : let it out , let it out

bạn know it ? ="