Finally and most importantly! I found the song I've been searching for, since PriSch! Amigos Para Siempre! After hearing a teacher sang it, I knew the lyrics and tune for the chorus ever since but I never recall the name. Luckily, TPJC Guitar club played this and I happen to hear it during our college day rehearsal so I got the name from Hannah and here it is!! Woohoo!

Love the chorus and I'm giving this to all my friends, especially to my 同类 - 外星人! This song so true! Haha!

Amigos para siempre
Means you'll always be my friend
Amics per sempre
Means a love that cannot end
Friends for life
Not just a summer or a spring
Amigos para siempre

I feel you near me Even when we are apart
Just knowing you are in this world
Can warm my heart
Friends for life
Not just a summer or a spring
Amigos para siempre