This is quite good although I see where it is heading. A young soon to be king want to sell off their kingdom but ended up benefiting. Last chapter make it clear that this to attain his goal of carefree , he need to proceed and improve his country. Spoiler Neighboring will invade and surely would be defeated but it wont end there as that invading country has a even more aggressive neighbor. This defeat will make them weaken and if their is dethrone they might place the mc as king for survival or serve as a vassal state.The more achievement he gather the less likely he would succeed in his goal In hindsight, if he wanted a carefree life he would just have to procreate (or adopt)and teach them ensure that they are capable of leading. The more capable they are the less work he will have.That is 2 decades at least.