There are so many obsessions among people in the world.
The romantic love, the desire to rule the world, the glory of galloping on the battlefield, and the regret that cannot be fulfilled before death. There are always some people or things like that lingering in the heart like flowing lines in the air, making you want and want them tightly.
Legend has it that there is a mysterious mystic in the world who can help you complete whatever you entrust in exchange for your lifelong obsession. He lives by obsession and has eternal youth and immortal appearance.