Forgotten Title BL quick trans

I remember 1 arc only
it's set in ancient China-ese setting, mc is a weak chicken
MC's attendant took some sort of scholar examination in his place(because mc is sick) in the original plot, then (this point on kind of unsure: ) maligned original host of stealing his works leading to his death
then now MC reincarnated in host body and exposed the protagonist of the original plot.

I think ML was frequently on a horse

additional info: translated chinese novel if I remember correctly

 

if i'm not wrong ..its "Who touched My Tail"

 

I already read that novel so I guess I wont reread the whole novel...

but do you know which arc is it?

 

It's the 1st arc

 

yapp the very first arc..