Trying tor refresh my memory here...when did Gok mark Yibin again?

when they were children...

i thought gok and yibin met in college..

I don't think it was specified when that happened? we just knew thanks to Ino's appearance cuz he noticed Gok had already marked someone.

oh sorry my mistake i thought you were talking about hwa hehehe...i think it happen one of their smex escapade and then the uke unconsciously mark yibin...