btw due to my lack of skill,it was a good but not perfect tying (thnx to the guy who may don't like to be named here) ; i usually don't use ropes, more often scarves and long bandannas, but not ropes...so i didn't check my wrists skin after undoing the knots..
the next morning _or that 2 days ago i mentioned_ i had to go and take part in a casual sitting of teachers in the school i work, it was about some discussions around the past term and other stuffs.
at the middle of that ,one of co workers poked on me and asked me about the red marks while pointing my wrists, which i just noticed ! oh God it was very bad...the rope marks remained and had changed to red wounds!
it was really embarrassing, i was really confused how to explain it, other times the marks were not that apparent and bold so i could just say:"oh these, i think it's because of my watch!"or" oh nothing,only hanged a heavy nylon bag from it" idon't know even could only say" wow, how it happened? i don't know ..."
but those marks were too obvious, the rope shape was recognizable !
i just wanted the earth to swallow me in...

ahh,thnxfully i got to distract her and i just wish she never ask me again about it...i really don't know how answer if she does!