You Ren, a giant knotweed, is the hero of "Curse Back to War" and a teenager who is accompanied by death. He swallowed the finger of the king of curses, who was sealed as a special curse, and was later identified as a once-in-a-thousand-year wizard. He was protected by the Five Enlightenments as a "container" of "two-faced exorcism" and was given an indefinite probation. After that, he transferred to Tokyo Institute of Mantra to study mantras and perform the task of eliminating curses.

You Ren of Polygonum cuspidatum is a very cheerful and warm-blooded person, but he also has inner growth and emotional portrayal.