In his quest for a stable job, Juyoon Oh's life takes a drastic turn when he jumps into the Han River to rescue a child, facing the threat of drowning. Just as he nears his end, a deity intervenes, granting him a new existence as a feeble 'brick larva,' devoid of prowess or abilities. Thus commences a challenging journey towards heroism, fraught with trials and the arduous path to greatness.