Jin-Woo Sung is the protagonist of the Korean web novel and anime series Solo Leveling. As a hunter, Sung possesses the unique ability to enter a combat-oriented world full of dungeons and monsters. He is stoic, resilient, and deeply self-reliant after enduring many hardships. His determination to protect those he loves propels him to grow stronger and to challenge the status quo of the hunter's world. He develops a close relationship with the reclusive and powerful Shadow Monarch, and as a result, gains access to extraordinary power. Sung has a complex relationship with his guildmates and especially with his supportive younger sister, Ji-Hye Sung. Despite his growing powers, he retains a grounded and modest demeanor. He dislikes those who underestimate him but is often called upon to lead others due to his strength and skills.

Ryōji, a figure enshrouded in an aura of arcane mystery, stands amidst the delicate dance of cherry blossoms, his white hair a cascade of moonlight amidst the petals. With crimson eyes, he commands attention, exuding an ethereal presence that belies the darkness of his attire. A red-inked card clutched in his hand whispers secrets of a world unknown, while the splashes of crimson ink against the backdrop of nature's canvas hint at a past steeped in intrigue and power. He is both a master and a mystery, beckoning those who dare to unravel his enigma.