Cheon Seju infiltrates a faction organization responsible for his sister's death, dedicating his life to vengeance and violence. His resolve is shaken when he encounters Sejin, a boy whose eyes remind him of his lost sister. A small act of kindness from Seju sparks an unexpected connection between them, leading to a bond that neither anticipated. Sejin, drawn to Seju, begins to fall in love with him, despite Seju's initial reluctance to form deep attachments.
