help finding manhwa name!

[hiddennoon]

i remember reading this manhwa and wanting to reread it
the mc has to solve the endings of books in order to be let out?? the master of all the books is this like little boy with grey hair and long sleeves lol.
i think there were several versions like with this prince with lightning powers who belong to a tiny kingdom and ants, like a murim one where a man and a woman of different sects are fighting and the way they resolve it is through having the mcs inherit their techniques and fight
sorry i’ve been going crazy trying to find this

 

[OnkelUnc]

The Name should be „The Player who can‘t Level up“ at least does your Description fit some parts of it