i became a childhood friend of a mid level boss

Do Kyunwoo is the black sheep of his renowned family of swordsmen. He can't even hunt a rabbit on his own. On his first day of fifth grade, he meets a transfer student and remembers his past life. He has reincarnated into the world of a game he used to play called [Brave Hearts]. He was already frustrated at being reincarnated as a loser, but on top of that, the transfer student is a Mid-Rank Boss who will destroy the world! "Why are you being so nice to me?" "Because I want to be your friend." Do Kyunwoo's plan is to become friends with the transfer student to prevent the end of the world! To survive in this new world and reach the ending he desires, he becomes the best friend of a Mid-Rank Boss.